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1. Pharmacological treatment
Introduction
Immediate release (IR) stimulant medications, methylphenidate (MPH) and dexamfetamine (DEX) have been used in the treatment of ADHD since the 1960s. From the mid-1990s the level of drug prescribing for ADHD increased markedly in the UK, coinciding initially with changes in the regulatory framework, and in the early-2000s with the introduction of modified release (once or twice daily) methylphenidate preparations (Concerta XL ®, Delmosart®, Equasym XL ®, Matoride XL®, Medikinet XL®, Xenidate XL®) and the non-stimulant, atomoxetine (Strattera ®). Recently, a once-daily preparation of lisdexamfetamine (Elvanse ®, a pro-drug of dexamfetamine) and guanfacine ER (Intuniv ®) have been introduced. At the time of writing this guideline, drugs licensed in the UK for the treatment of ADHD in children aged 6 years and over include: immediate and modified release methylphenidate and dexamfetamine preparations, atomoxetine and modified-release guanfacine.
This picture is further complicated in that few drugs are licensed in the UK for the initiation of treatment in adults that have received a new diagnosis of ADHD. One lisdexamfetamine preparation (Elvanse adult ®) is licensed for use in newly diagnosed adults and one methylphenidate preparation (Medikinet XL®) is in the final stages of having a license to treat adults with diagnosed and newly diagnosed ADHD, atomoxetine is licensed for use in adults if the presence of symptoms of ADHD in childhood are confirmed and some methylphenidate preparations (Concerta XL®, Delmosart ®, Matoride XL ®, Medikinet XL®, Xiggitin XL®, Xenidate XL®) are licensed for continuation of treatment from childhood or adolescence.
Despite a large treatment literature supporting the short-term benefits of stimulant medication in children with ADHD, uncertainty still surrounds the quality of evidence and the balance of risks and benefits of long-term drug treatment for ADHD in children and young people.
In adults the evidence base is far smaller and there are more unanswered questions. Although stimulants are the most studied treatment for ADHD, their use in adults is still limited. It remains an anomaly that many drugs that are considered to be safe and effective in children and young people are not licensed for use in adults.
Key unanswered questions for clinicians treating all age groups concern the best sequence of medications to use, the optimum duration of treatment, when it is appropriate to consider drug discontinuation, which drug treatments to use in the presence of co-existing conditions and how and when to combine pharmacological and non-pharmacological interventions. Important questions also relate to safety issues with ADHD medications, monitoring and review as well as the balance of risks and benefits of ADHD drug treatment in less well studied groups such as pre-school children, those with co-occurring mental and physical health conditions, neurodevelopmental disorders, or learning disabilities.
The aim of this review, is to evaluate the evidence for the clinical and cost effectiveness of the pharmacological management of children, young people and adults with ADHD. There are two reviews; the first, evaluating the most clinically and cost effective pharmacological treatment for people with ADHD and the second explores the most clinically and cost-effective sequence of pharmacological treatment for children and young people and adults with ADHD. This review should be read alongside the evidence report E on adverse events and evidence report F: combination treatment, for the detail on when to decide on which treatment approach to take (pharmacological or non-pharmacological).
1.1. Review question: What is the most clinically and cost-effective pharmacological treatment for people with ADHD?
1.1.2. Methods and process
This evidence review was developed using the methods and process described in Developing NICE guidelines: the manual.474 Methods specific to this review question are described in the review protocol in appendix A.
Declarations of interest were recorded according to NICE’s 2014 conflicts of interest policy.
This review sought to evaluate the clinical and cost effectiveness of pharmacological interventions to treat ADHD. The population of this review was stratified by age (children aged under 5 years, children and young people (5–18 years), and adults (over 18) as the guideline committee believed that the effectiveness of pharmacological treatment would vary between these populations and some outcomes were relevant for only one of the age strata.
Studies were excluded if they selected for a population exclusively on the basis of response to the drug under investigation, for example if the inclusion criteria were ‘previously used and responded to methylphenidate’ and the study compared methylphenidate with placebo.
A number of Cochrane reviews were identified which evaluated the effectiveness of pharmacological treatments for people with ADHD144, 512, 513, 520, 627, 628. As all of the reviews included some studies that did not match the review protocol (for example, treatments not on the protocol, studies that included only known responders), no review was fully included. Rather, the references of each review were checked, and the data from relevant studies were independently extracted and assessed for quality.
A network meta-analysis was considered for this question but deemed inappropriate due to concerns over differences in trial populations, exact trial interventions and insufficient data available for the relevant outcomes (see the methodology chapter for further details).
1.1.3. Clinical evidence
1.1.3.1. Included studies (children under the age of 5)
Four RCTs were included in the review41, 275, 291, 540 that evaluated the effectiveness of pharmacological treatments in pre-school age children (under 5 years of age); these are summarised in Table 2 below.
Two studies compared the effectiveness of methylphenidate versus placebo275, 291, one study compared risperidone versus placebo41, while the other compared risperidone versus standard treatment 540. One of these studies41 did not state whether any children included in the sample had previously received medication. The other studies included both stimulant naïve children and children that had previously received psychotropic medication146, 275, 291. The last study compared risperidone to standard treatment had both groups receiving methylphenidate 540. Evidence from these studies is summarised in the clinical evidence summary tables below (Table 5, Table 6 and Table 7)
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
1.1.3.2. Excluded studies
See the excluded studies list in appendix I.
1.1.3.3. Summary of clinical studies included in the evidence review (children under the age of 5)
See appendix D for full evidence tables.
1.1.3.4. Included studies (children and young people aged 5 to 18)
Seventy RCTs were included in the review3, 25, 35, 45, 62, 67, 87, 89, 95, 100, 118, 129, 142, 167, 172, 177, 178, 181, 198, 200, 202, 208, 235, 260, 267, 272, 293, 309, 316, 341, 346, 347, 351, 362, 367, 379, 390, 391, 430, 450, 452, 456, 457, 460, 469, 471, 476, 479, 491, 503, 539, 546, 553, 554, 576, 577, 590, 592, 598, 615, 631, 633, 639, 647, 657, 658, 672, 695, 702, 712 that evaluated the effectiveness of pharmacological treatments in children and young people (5–18 years of age); these are summarised in Table 3 below. The following comparisons were included in the review:
- one RCT compared immediate release methylphenidate versus extended release methylphenidate 702
- one RCT compared lisdexamfetamine versus placebo 167
- one RCT compared methylphenidate versus lisdexamfetamine 167
- one compared atomoxetine versus guanfacine extended release 341
- one RCT compared guanfacine versus placebo 553
- one RCT compared clonidine versus methylphenidate 491
- one RCT compared clonidine versus desipramine 577
- one RCT compared clonidine versus carbamazepine 471
- one RCT compared venlafaxine versus methylphenidate 712
- one RCT compared aripiprazole versus placebo 631
- one RCT compared buspirone versus placebo 198
- one RCT compared modafinil versus methylphenidate 35
- one RCT compared melatonin versus placebo 639
- one RCT compared amantadine versus methylphenidate 457
- one RCT compared atomoxetine versus fluoxetine versus atomoxetine.390
Evidence from these studies is summarised in the clinical evidence summary tables below.
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
See appendix D for full evidence tables.
1.1.3.5. Included studies (adults)
Thirty nine RCTs were included in the review8, 11, 12, 16, 21, 34, 50, 84, 90, 91, 110, 117, 140, 162, 216, 282, 287, 288, 306, 386, 393, 401, 446, 449, 494, 522, 524, 527, 533, 591, 593, 608, 620, 621, 625, 666, 667, 689, 711 that evaluated the effectiveness of pharmacological treatments in adults these are summarised in Table 4 below. The following comparisons were included in this review:
- one RCT compared guanfacine versus placebo 621
- one RCT compared guanfacine versus dexamfetamine 621
- one RCT compared reboxetine versus placebo 527
- one RCT compared venlafaxine versus placebo 34
- one RCT compared bupropion versus methylphenidate 393
- one RCT compared modafinil versus dexamfetamine 620
- one RCT compared atomoxetine and buspirone versus placebo 608
Evidence from these studies is summarised in the clinical evidence summary below.
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
See appendix D for full evidence tables.
1.1.3.6. Quality assessment of clinical studies included in the evidence review (children under the age of 5)
1.1.3.7. Quality assessment of clinical studies included in the evidence review (children aged 5 to 18 years)
1.1.4. Economic evidence
1.1.4.1. Included studies
1.1.4.1.1. 2008 guideline literature
One study from CG72 was included in this review372
The included study can be found in Table 51.
1.1.4.1.2. Published literature
Two health economic studies were identified in children with the relevant comparison and have been included in this review.188,332 One economic evaluation was also identified in adults.717
One study on children was from the UK and used a decision model to compare an algorithm with atomoxetine as first line treatment versus an algorithm of standard treatment (without atomoxetine) in different subgroup populations (only the medication naïve group have been included in this review question).
The second study on children adapted the model from the UK study to a Spanish context, however it compared a sequence of atomoxetine as first line versus atomoxetine as second line (and did not include dexamfetamine in the sequence). Therefore the interventions were different, and it only looked at some of the subgroups that the UK paper looked at (again only some of which are included in this review), therefore the models were thought to be sufficiently different to be included as separate studies.
Note that although these studies compare sequences in different ways, they are both essentially asking which drug you should start with.
The adult study was from the UK and used a decision model to compare lisdexamfetamine with atomoxetine or extended release methylphenidate.
These are summarised in the health economic evidence profiles below (Table 52, Table 53) and the health economic evidence tables in Appendix H.
See also the health economic study selection flow chart in Appendix G.
1.1.4.2. Excluded studies
Five studies 211, 250, 278, 357, 473, 718 from CG72, all in children, have been selectively excluded due to limited applicability and/or methodological limitations.
These are listed in Appendix I, with reasons for exclusion given.
See also the health economic study selection flow chart in appendix G.
1.1.4.3. Summary of studies included in the economic evidence review
Since the previous guideline, the price of dexamfetamine has substantially increased. This is likely to affect the conclusions of all included economic studies with dexamfetamine, as they are out of date with the costs.
King et al 2006372 was replicated using the information in the study, to see what impact updating the cost of the interventions would have. The original base case result of King 2006 showed that the most cost effective strategy was;
Dexamfetamine – Methylphenidate IR – Atomoxetine – No treatment.
This was also the case when the model was replicated without changing the drug costs. This added reassurance that the replication was similar to the original model (although some assumptions had to be made based on the information provided in the paper in order to replicate the model).
After updating the model to include up to date drug prices, the most cost effective option was;
Methylphenidate IR – Atomoxetine – Dexamfetamine – No treatment.
This shows that keeping all other parts of the model the same except for updating the drug prices is having an impact of the results enough to change the conclusions. The increased price of dexamfetamine means that it is no longer cost effective first or second line even though it has a higher response rate and fewer withdrawals than the other drugs. The increased cost is outweighing the additional benefit.
Note that the same limitations of the model remain as the purpose of this exercise was only to see the impact of the price changes and structural and data aspects of the model cannot be altered as it is not an original guideline model. Notable limitations include that the treatments in the sequence are independent of each other which is unlikely to reflect reality, and also the limited number of sources informing the clinical effect.
Cottrell 2008 also included dexamfetamine in the sequences evaluated. This study had 5 subgroups, which had different sequences for the intervention and comparator of each subgroup depending on previous history with stimulants. As the purpose of this study is to estimate the costs and benefits of atomoxetine versus other treatments, then the intervention arm for each subgroup always had atomoxetine first followed by other treatments, and the comparator sequence was the same sequence but without atomoxetine.
For example for a stimulant naïve population the treatments being evaluated are a sequence of; ATX - IR MPH - IR DEX - no treatment, versus; IR MPH - IR DEX - no treatment.
Because of this, dexamfetamine will always be closer to the front of the sequence in the comparator arm. Meaning that in the comparator arm, more people will be on dexamfetamine because you only go on to the next treatment if you fail the previous one. Therefore a dexamfetamine price increase will increase the total cost of the comparator arm more than the total cost of the intervention arm, therefore making the incremental cost smaller and the intervention arm more cost effective. It may even make the intervention cost saving. These are assumptions about what the impact will be, but it has been shown from the update of the King model that sequences with dexamfetamine lower down the treatment line are likely to be more cost effective than sequences with dexamfetamine nearer the front of the sequence, because of the higher price of dexamfetamine.
1.1.4.4. Unit costs
Relevant unit costs are provided below to aid consideration of cost-effectiveness. The drugs listed below are based on those identified from the clinical review as well as those commonly used even if the review did not find evidence on them, and therefore do not include the entire list of interventions from the protocol.
The costs below are illustrative. For the commonly used ADHD drugs; a low and high dose has been demonstrated and taken from the BNF. Some doses were not taken from the BNF and the reason for this is highlighted. Advice has also been taken from the BNF about whether a single dose per day or the doses can be divided, where available. For drugs that are not used for ADHD then the clinical review was used for dosing information.
Note that there can be various branded generic versions of a drug, but drugs of the same class with the same dose have the same cost in the drug tariff regardless of who manufactures it.
The pricing structure of the different drugs can also impact the overall cost, as if you are taking a higher dose you could do this once a day, then a higher dose tablet tends to be cheaper than taking two tablets of half the dose. So with most drugs then are economies of scale of the higher formulations. This isn’t always the case though. With some drugs it is possible to take only one tablet a day such as the modified release versions but with others you would need to take tablets at multiple points in the day which means more pills per day of lower formulations.
Costs of other healthcare resource such as hospital appointments that may differ by intervention is illustrated below.
For example, people on stimulants may see healthcare professionals more frequently in the beginning in order to make sure the dose is appropriate and then may see healthcare professionals less frequently.
1.1.5. Resource impact
We do not expect recommendations resulting from this review area to have a significant impact on resources.
1.1.6. Evidence statements
1.1.6.1. Clinical evidence statements
1.1.6.1.1. Children under 5
Methylphenidate versus placebo
- No evidence was identified for quality of life, CGI-I, serious adverse events or discontinuation due to adverse events. No evidence was identified for any of the important outcomes except behavioural outcomes measured by the children’s global assessment scale.
- There was a clinically important benefit of methylphenidate for ADHD symptoms total (parent-teacher composite; 1 study very low quality) (parent rated; 1 study low quality) and behavioural symptoms (1 study low quality)
Risperidone versus methylphenidate
- No evidence was identified for quality of life, CGI-I or serious adverse events. No evidence was identified for any of the important outcomes.
- There was no clinical difference between risperidone and methylphenidate on total, inattentive and hyperactivity ADHD symptoms (parent rated; 1 study very low quality).
- The number of children discontinuing their medication due to adverse events was lower for risperidone compared to methylphenidate, and this was clinically important (1 study very low quality).
Risperidone and methylphenidate versus methylphenidate
- No evidence was identified for quality of life. No evidence was identified for any of the important outcomes except behavioural outcomes measured by the CPRS oppositional subscale.
- There was no clinical difference on total, inattention and hyperactivity ADHD symptoms and behaviour outcomes as reported by parents (1 study very low quality).
- There was a clinically important benefit of methylphenidate and risperidone combined on CGI-I (1 study very low quality).
- There was clinically important harm of risperidone and methylphenidate combined on discontinuation due to adverse events (1 study low quality).
1.1.6.1.2. Children and young people aged 5 to 18
Immediate release (IR) methylphenidate versus placebo
- No evidence was identified for quality of life, or serious adverse events. No evidence for any of the important outcomes except behavioural outcomes measured by children’s Global assessment scale.
- There was a clinically important benefit of methylphenidate for ADHD total symptoms (parent rated; 2 studies low quality) (teacher rated; 2 studies low quality) (teacher rated; 1 study moderate quality), ADHD inattention symptoms (parent rated; 1 study moderate quality) (teacher rated; 1 study moderate quality), ADHD hyperactivity symptoms (teacher rated, 3 studies low to moderate quality), CGI-I (3 studies moderate quality), behavioural outcomes (2 studies low quality).
- There was no clinical difference for ADHD symptoms total (parent rated; 3 studies moderate quality), ADHD hyperactivity symptoms (parent rated; 1 study low quality) (teacher rated; 1 study low quality), discontinuation due to adverse events (4 studies low quality) and serious adverse events (1 study moderate quality).
OROS Methylphenidate versus placebo
- No evidence was identified for serious adverse events. No evidence was identified for any of the important outcomes except for behavioural outcomes and academic achievement.
- There was a clinically important benefit of methylphenidate for quality of life (1 study low quality), total ADHD symptoms (parent rated; 2 studies moderate quality) (teacher rated; 1 study moderate quality) (investigator rated 1 study moderate quality), ADHD inattention symptoms (parent rated; 2 studies moderate quality) (teacher rated; 2 studies low quality) (investigator rated; 1 study very low quality), ADHD hyperactivity symptoms (parent rated; 2 studies moderate quality) (teacher rated; 2 studies moderate quality) (investigator rated; 1 study very low quality), CGI-I (2 studies moderate quality), behavioural outcomes (1 study low quality) and academic achievement (1 study low quality).
- There was no clinical difference in the number of children discontinuing their medication due to adverse events (3 studies low quality).
IR methylphenidate versus OROS methylphenidate
- No evidence was identified for quality of life, serious adverse events or any of the important outcomes.
- There was no clinically important difference for ADHD inattention symptoms (teacher rated; 1 study moderate quality) (parent rated; 1 study moderate quality), ADHD hyperactivity symptoms (teacher rated; 1 study moderate quality) (parent rated; 1 study moderate quality), CGI-I (1 study low quality) and discontinuation due to adverse events (1 study low quality).
Lisdexamfetamine versus placebo
- No evidence was identified for quality of life, inattentive or hyperactivity ADHD symptoms or serious adverse events. No evidence for any of the important outcomes except behaviour outcomes as measured by the WFIRS-P scale and academic achievement as measured by the CHIP-CE academic achievement subscale.
- There was a clinically important benefit of lisdexamfetamine for ADHD total symptoms (investigator rated; 1 study moderate quality), CGI-I, academic achievement and behaviour outcomes (1 study moderate quality).
- There was no clinical difference for discontinuation due to adverse events (2 studies very low quality).
Methylphenidate versus lisdexamfetamine
- No evidence was identified for quality of life, inattentive or hyperactivity ADHD symptoms and serious adverse events. No evidence for any of the important outcomes except behaviour outcomes as measured by the WFIRS-P scale and academic achievement as measured by the CHIP-CE academic achievement subscale.
- There was a clinically important benefit of lisdexamfetamine for ADHD total symptoms (investigator rated; 1 study moderate quality) and CGI-I (1 study, low quality).
- There was no clinical difference for discontinuation due to adverse events, academic achievement and behaviour outcomes (1 study low quality).
Atomoxetine versus placebo
- No evidence for any of the important outcomes except behavioural outcomes measured by various scales and academic achievement measured by the CHIP-PRF achievement subscale.
- There was a clinically important benefit of atomoxetine for quality of life (2 studies moderate quality) (1 study low quality), treatment response (2 studies low quality), ADHD total symptoms (investigator rated; 3 studies low quality) (investigator rated; 6 studies moderate quality) (teacher rated; 5 studies moderate quality) (teacher rated; 1 study low quality) (parent rated; 9 studies high quality) (parent rated; 2 studies low quality) (parent rated; 3 studies moderate quality), ADHD inattention symptoms (investigator rated; 5 studies low quality) (teacher rated; 5 studies low quality) (parent rated; 9 studies low quality) (parent rated; 2 studies low quality) (parent rated; 3 studies moderate quality), ADHD hyperactivity symptoms (investigator rated; 5 studies moderate quality) (teacher rated; 4 studies moderate quality) (teacher rated; 1 study low quality) (parent rated; 12 studies moderate quality) (parent rated; 2 studies very low quality), CGI-I (5 studies moderate quality) and behavioural outcomes (2 studies low quality).
- There was no clinical difference for behavioural outcomes (3 studies moderate quality), academic achievement (1 study low quality), discontinuation due to adverse events (16 studies moderate quality) (2 studies low quality) and serious adverse events (3 studies low quality).
Atomoxetine versus methylphenidate
- No evidence was identified for CGI-I or serious adverse events. No evidence for any of the important outcomes except behavioural outcomes measured on the CPRS oppositional subscale.
- There was no clinical differences for quality of life (1 study moderate quality), total, inattentive and hyperactivity ADHD symptoms (parent rated; 2 studies moderate quality) or behavioural outcomes (1 study moderate quality). More children discontinued atomoxetine due to adverse events compared to methylphenidate (1 study moderate quality).
Atomoxetine versus guanfacine extended release
- No evidence was identified for quality of life, serious adverse events or any important outcomes.
- There was a clinically important benefit of guanfacine for ADHD total symptoms (investigator rated; 1 study low quality), CGI-I (1 study low quality)
- There was no clinically important difference in the number of children discontinuing due to adverse events (1 study low quality).
Guanfacine versus placebo
- No evidence was identified for quality of life, discontinuation due to adverse events or serious adverse events. No evidence for any of the important outcomes.
- There was a clinically important benefit of guanfacine for total and hyperactivity ADHD symptoms (investigator rated; 1 study moderate quality) and CGI-I scores (1 study high quality).
- There was no clinically important difference for ADHD inattention symptoms (investigator rated; 1 study moderate quality).
Extended release Guanfacine versus placebo
- No evidence was identified for quality of life. No evidence for any of the important outcomes except for academic achievement as measured by the WFIRS academic performance subscale.
- There was a clinically important benefit of extended release guanfacine for total ADHD symptoms (investigator rated; 6 studies low quality), ADHD inattention symptoms (investigator rated; 4 studies low quality), ADHD hyperactivity symptoms (investigator rated; 5 studies high to moderate quality) and CGI-I scores (5 studies moderate quality).
- There was clinically important harm of extended release guanfacine for serious adverse events (1 study very low quality); 1 participant in the guanfacine arm had a serious adverse event, compared to zero in the placebo arm.
- There was no clinically important difference for academic outcomes (1 study high quality) and discontinuation due to adverse events (8 studies high quality).
Clonidine versus placebo
- No evidence was identified for quality of life or CGI-I. No evidence for any of the important outcomes except for behavioural outcomes, as measured by CGAS.
- There was a clinically important benefit of clonidine for ADHD total symptoms (parent rated; 2 studies low quality) (teacher rated; 2 studies low quality) (investigator rated; 1 study low quality), ADHD inattention symptoms (investigator rated; 1 study low quality) and hyperactivity symptoms (investigator rated, 1 study low quality) (parent/teacher rated; 1 study high quality) and behaviour outcomes (2 studies very low quality).
- There was no clinical difference for discontinuation due to adverse events (2 studies moderate quality) or serious adverse events (1 study high quality).
Clonidine versus methylphenidate
- The only evidence identified was on ADHD total symptoms, discontinuation due to adverse events and behavioural outcomes, as measured by CGAS.
- There was a clinically important benefit of methylphenidate for ADHD total symptoms (teacher rated; 1 study very low quality) (parent rated; 1 study very low quality).
- There was no clinical difference for behavioural outcomes (1 study low quality) or in discontinuation rates due to adverse events (1 study very low quality).
Clonidine versus desipramine
- The only evidence identified was on ADHD hyperactivity symptoms.
- There was a clinically important benefit of desipramine for ADHD hyperactivity symptoms (parent/teacher rated; 1 study high quality).
Clonidine versus carbamazepine
- The only evidence identified was on ADHD symptoms.
- There was a clinically important benefit of clonidine for ADHD inattention symptoms (investigator rated; 1 study very low quality), ADHD hyperactivity symptoms (investigator rated; 1 study low quality) and ADHD impulsivity symptoms (investigator rated; 1 study low quality).
Desipramine versus placebo
- The only evidence identified was on total ADHD symptoms.
- There was a clinically important benefit of desipramine for ADHD total symptoms (investigator rated; 1 study high quality) and ADHD hyperactivity symptoms (parent/teacher rated; 1 study high quality).
Venlafaxine versus methylphenidate
- The only evidence identified was for total ADHD symptoms.
- There was no clinical difference in ADHD total symptoms (parent and teacher rated; 1 study moderate quality).
Risperidone versus placebo
- No evidence was identified for quality of life, CGI-I, ADHD total symptoms and discontinuation due to adverse events. No evidence for any of the important outcomes except for behavioural outcomes as measured by multiple scales including CGAS.
- There was a clinically important benefit of risperidone for behaviour outcomes (1 study moderate quality) and serious adverse events (1 study low quality).
- There was no clinical difference for ADHD inattention and hyperactivity symptoms (parent rated; 1 study moderate quality) or behavioural outcomes measured by the ABC and CPRS oppositional subscale (2 studies moderate quality).
Ariprazole versus placebo
- The only evidence identified was for ADHD total symptoms.
- There was clinically important harm of ariprazole for ADHD total symptoms (parent rated; 1 study low quality).
Buspirone versus methylphenidate
- The only evidence identified was for ADHD total symptoms, discontinuation due to adverse events and serious adverse events.
- There was a clinically important benefit of methylphenidate for ADHD total symptoms (parent rated; 2 studies low to very low quality) (teacher rated; 1 study moderate quality).
- There was clinically important harm of buspirone for discontinuation due to adverse events (1 study very low quality).
- There was no clinical difference for serious adverse events (1 study low quality).
Buproprion versus placebo
- The only evidence identified was for ADHD total symptoms and discontinuation due to adverse events.
- There was a clinically important benefit of buproprion for ADHD total symptoms (parent and teacher rated, 2 studies moderate quality).
- There was clinically important harm of buproprion for discontinuation due to adverse events (2 studies low quality).
Buproprion versus methylphenidate
- The only evidence identified was for ADHD symptoms, serious adverse events and discontinuation due to adverse events.
- There was a clinically important benefit of methylphenidate for ADHD total symptoms (parent rated; 2 studies low quality) (teacher rated; 1 study low quality), ADHD inattention symptoms (parent rated; 1 study low quality).
- There was no clinical difference for ADHD total symptoms (teacher rated; 1 study low quality), ADHD inattention symptoms (parent rated; 1 study low quality) (teacher rated, 1 study low quality), ADHD hyperactivity symptoms (parent rated; 1 study very low quality) (teacher rated; 1 study low quality), discontinuation due to adverse events (1 study low quality) and serious adverse events (1 study low quality).
Modafinil versus placebo
- No evidence was identified for quality of life or ADHD hyperactivity or inattention symptoms. No evidence for any important outcomes.
- There was a clinically important benefit of modafinil for ADHD total symptoms (parent rated; 1 study low quality) (teacher rated; 2 studies very low quality) and CGI-I (1 study low quality).
- There was no clinical difference for serious adverse events (1 study low quality).
- There was clinically important harm of modafinil for discontinuation due to adverse events (1 study very low quality).
Modafinil versus methylphenidate
- The only evidence identified was for ADHD total symptoms.
- There was no clinical difference for total symptoms (parent and teacher rated; 1 study low quality).
Melatonin versus placebo
- The only evidence identified was for quality of life, discontinuation due to adverse events and behavioural outcomes as measured by the Teachers Report Form.
- There was no clinical difference for quality of life, behavioural outcomes or discontinuation due to adverse events (1 study moderate to high quality).
Amantadine versus methylphenidate
- The only evidence identified was for ADHD inattention and hyperactivity symptoms.
- There was no clinical difference for ADHD inattention or hyperactivity symptoms (parent and teacher rated; 1 study low quality).
Methylphenidate and clonidine versus methylphenidate
- The only evidence identified was for ADHD total symptoms, behaviour outcomes (measured by CGAS) and discontinuation due to adverse events.
- There was a clinically important benefit of ADHD total symptoms (parent and teacher rated; 1 study low to very low quality), and behaviour outcomes (1 study very low quality).
- There was clinically important harm of methylphenidate and clonidine combined for discontinuation due to adverse events (1 study low quality).
Methylphenidate and clonidine versus clonidine
- The only evidence identified was for ADHD total symptoms, behaviour outcomes (measured by CGAS) and discontinuation due to adverse events.
- There was a clinically important benefit of methylphenidate and clonidine combined for ADHD total symptoms (parent and teacher rated; very low quality), and behaviour outcomes (1 study very low quality).
- There was no clinical difference for discontinuation due to adverse events (1 study very low quality).
Methylphenidate and clonidine versus placebo
- The only evidence identified was for ADHD total symptoms, behaviour outcomes (measured by CGAS) and discontinuation due to adverse events.
- There was a clinically important benefit of methylphenidate and clonidine for ADHD total symptoms (parent and teacher rated; 2 studies very low quality), and behaviour outcomes (2 studies very low quality).
- There was clinically important harm of methylphenidate and clonidine combined for discontinuation due to adverse events (1 study very low quality).
Atomoxetine and fluoxetine versus atomoxetine
- The only evidence identified was for ADHD symptoms and discontinuation due to adverse events.
- There was a clinically important benefit of atomoxetine and fluoxetine combined for ADHD inattention symptoms (investigator rated; 1 study very low quality).
- There was no clinical difference for ADHD total and hyperactivity symptoms (investigator rated; 1 study very low quality) or discontinuation due to adverse events (1 study very low quality).
1.1.6.1.3. Adults
Immediate release methylphenidate versus placebo
- There was no evidence identified for quality of life or serious adverse events. No evidence for important outcomes except for behaviour outcomes, as measured by the global assessment of functioning and problem behaviour scale.
- There was a clinically important benefit of methylphenidate for ADHD total symptoms (investigator rated; 3 studies very low to moderate quality), treatment response (2 studies low quality) and CGI-I (2 studies moderate quality).
- There was clinically important harm of methylphenidate for discontinuation due to adverse events (2 studies high quality).
- There was no clinical difference for behaviour outcomes (2 studies moderate quality).
OROS methylphenidate versus placebo
- There was no evidence for serious adverse events.
- There was a clinically important benefit of methylphenidate for treatment response (3 studies moderate quality), ADHD total symptoms (investigator rated; 4 studies low quality) (investigator rated; 2 studies moderate quality) (self-rated, 2 studies moderate quality) (self-rated; 2 studies low quality) (self-rated; 1 study low quality), ADHD inattention symptoms (investigator rated; 1 study low quality) (investigator rated; 1 study low quality) (self rated; 1 study moderate quality), ADHD hyperactivity symptoms (investigator rated; 2 studies low quality), CGI-I (3 studies moderate quality) and behaviour outcomes (1 study high quality), emotional dysregulation (1 study moderate quality).
- There was no clinical difference for ADHD inattention symptoms (investigator rated; 2 studies moderate quality), ADHD hyperactivity symptoms (investigator rated; 2 studies low quality)(self-rated; 1 study moderate quality) and emotional dysregulation (1 study very low quality).
- There was clinically important harm of methylphenidate for discontinuation due to adverse events (9 studies high quality) or quality of life (1 study high quality)
Dexamfetamine versus placebo
- The only evidence identified was for ADHD symptoms and CGI-I.
- There was a clinically important benefit of dexamfetamine for ADHD total, inattention and hyperactivity symptoms (investigator rated; 2 studies moderate quality) and CGI-I (1 study moderate quality).
Lisdexamfetamine versus placebo
- No evidence was identified for serious adverse events. No evidence for important outcomes except for behaviour outcomes, as measured by the GAF scale,
- There was a clinically important benefit of lisdexamfetamine for ADHD total symptoms (investigator rated; 3 studies moderate quality), ADHD inattention symptoms (investigator rated; 1 study low quality), ADHD hyperactivity symptoms (investigator rated; 1 study low quality), CGI-I (1 study moderate quality) and behaviour outcomes (1 study low quality).
- There was no clinical difference for quality of life (1 study very low quality) or discontinuation due to adverse events (3 studies very low quality).
Atomoxetine versus placebo
- There was no evidence for CGI-I or serious adverse events.
- There was a clinically important benefit of atomoxetine for quality of life (5 studies low to moderate quality), ADHD total symptoms (investigator rated, 10 studies low to very low quality) (self-rated; 2 studies low quality), ADHD inattention symptoms (self-rated; 2 studies low quality) (investigator rated; 9 studies low to very low quality) and ADHD hyperactivity symptoms (investigator rated; 9 studies very low quality) (self-rated, 2 studies moderate quality).
- There was clinically important harm of atomoxetine for discontinuation due to adverse events at 24 weeks (1 study moderate quality).
- There was no clinical difference for behaviour outcomes (2 studies low quality) or discontinuation due to adverse events up to 14 weeks (7 studies moderate quality).
Guanfacine versus placebo
- The only evidence identified was for ADHD symptoms.
- There was a clinically important benefit of guanfacine for ADHD total, inattention and hyperactivity symptoms (investigator rated; 1 study moderate quality).
Guanfacine versus dexamfetamine
- The only evidence identified was for ADHD symptoms.
- There was no clinical difference of ADHD total, inattention or hyperactivity symptoms (investigator rated; 1 study low to moderate quality)
Reboxetine versus placebo
- The only evidence identified was for ADHD symptoms, discontinuation due to adverse events and behaviour outcomes as measured by the GAF scale.
- There was a clinically important benefit of reboxetine for ADHD total symptoms (investigator rated; 1 study low quality), ADHD inattention symptoms (investigator rated; 1 study very low quality) and behaviour outcomes (1 study low quality).
- There was no clinical difference for ADHD hyperactivity symptoms (1 study very low quality) or discontinuation due to adverse events (1 study low quality).
Venlafaxine versus placebo
- The only evidence identified was for ADHD symptoms, discontinuation due to adverse events and serious adverse events.
- There was a clinically important benefit of venlafaxine for ADHD total, inattention and hyperactivity symptoms (self-rated; 1 study low to moderate quality).
- There was no clinical difference for discontinuation due to adverse events (1 study very low quality) or serious adverse events (1 study low quality).
Bupropion versus placebo
- The only evidence identified was for ADHD total symptoms, CGI-I and discontinuation due to adverse events.
- There was a clinically important benefit of buproprion for ADHD total symptoms (investigator rated, 1 study moderate quality), CGI-I (1 study low quality) and discontinuation due to adverse events (1 study very low quality)
- There was no clinical difference for ADHD total symptoms (investigator rated, 1 study very low quality)
Bupropion versus methylphenidate
- The only evidence identified was for ADHD total symptoms, CGI-I and discontinuation due to adverse events.
- There was a clinically important benefit of buproprion for ADHD total symptoms (investigator rated, 1 study low quality), CGI-I (1 study very low quality) and discontinuation due to adverse events (1 study low quality).
Modafinil versus placebo
- There was no evidence identified for CGI-I, serious adverse events or emotional dysregulation.
- There was a clinically important benefit of modafinil for ADHD total symptoms (self-rated; 1 study low quality) (investigator rated; 1 study moderate quality), ADHD inattention symptoms (investigator rated; 1 study high quality) and ADHD hyperactivity symptoms (investigator rated; 1 study moderate quality).
- There was clinically important harm of modafinil for discontinuation due to adverse events (1 study low quality).
- There was no clinical difference for quality of life (1 study low quality) or behaviour outcomes (1 study low quality).
Modafinil versus dexamfetamine
- The only evidence identified was for ADHD symptoms.
- There was no clinical difference for ADHD total, inattention and hyperactivity symptoms (investigator rated; 1 study moderate to low quality).
Atomoxetine and buspirone versus placebo
- The only evidence identified was for ADHD symptoms and discontinuation due to adverse events.
- There was a clinically important benefit of atomoxetine and buspirone for ADHD total symptoms (investigator rated; 1 study low quality).
- There was no clinical difference for ADHD inattention or hyperactivity symptoms (investigator rated; 1 study low quality) or discontinuation due to adverse events (1 study low quality).
1.1.6.2. Health economic evidence statements
- One cost-utility analysis found that a sequence of; Dexamfetamine – [methylphenidate-IR] – atomoxetine – no treatment, was dominant compared to other sequences of drugs for treating ADHD in children. This analysis was assessed as partially applicable with potentially serious limitations.This analysis was adapted with up to date intervention costs and found that a sequence of; [methylphenidate-IR] – Atomoxetine – Dexamfetamine – no treatment, was cost effective compared to other sequences of drugs for treating ADHD in children (ICER: £485 compared to no treatment). This analysis was assessed as partially applicable with potentially serious limitations.
- One cost-utility analysis found that for treating ADHD in children:
- In stimulant naive patients, a sequence of atomoxetine – IR-MPH (or XR-MPH) – IR-DEX – no treatment was cost effective compared to the same sequence without atomoxetine (ICER: £15,244 if IR-MPH and £13,241 with XR-MPH)
- In stimulant contraindicated (naive) patients, a sequence of atomoxetine – no treatment was cost effective compared to no treatment alone (ICER: £11,523)
This analysis was assessed as partially applicable with potentially serious limitations.
- One cost-utility analysis found that for treating ADHD in children:
- In stimulant naïve patients, a sequence of atomoxetine – IR-MPH – no treatment was not cost effective compared to a sequence of IR-MPH – atomoxetine – no treatment (ICER: £31,007)
- In stimulant naïve patients, a sequence of atomoxetine – XR-MPH – no treatment was cost effective compared to a sequence of IR-MPH – atomoxetine – no treatment at a threshold of £30,000 per QALY gained, but was not cost effective at a threshold of £20,000 per QALY gained (ICER: £21,971)
- In stimulant naïve patients with contraindications, atomoxetine was cost effective compared to no treatment at a threshold of £30,000 per QALY gained, but was not cost effective at a threshold of £20,000 per QALY gained (ICER: £21,079)
This analysis was assessed as partially applicable with potentially serious limitations.
- One cost-utility analysis found that Lisdexamfetamine was dominant compared to atomoxetine and ER-MPH for treating ADHD in adults. This analysis was assessed as directly applicable with veryserious limitations.
1.2. Review question: What is the most clinically and cost-effective sequence of pharmacological treatment for children and young people and adults with ADHD?
1.2.2. Methods and process
This evidence review was developed using the methods and process described in Developing NICE guidelines: the manual.474 Methods specific to this review question are described in the review protocol in appendix A.
This review sought to evaluate the clinical and cost effectiveness of the sequence of pharmacological interventions to treat ADHD in people who have previously been either intolerant or non-responsive to pharmacological treatment. Studies were only included if the population had been selected based on previous failed attempt to use any one specific drug (for example all were intolerant to atomoxetine), an exception was made if the population had all failed a previous attempt of the stimulant class. It was noted in each outcome whether the previous treatment was stopped or continued throughout the trial. Previous treatment continued was termed augmentation and previous treatment that was stopped was called substitution.
Declarations of interest were recorded according to NICE’s 2014 conflicts of interest policy.
1.2.3. Clinical evidence
1.2.3.1. Included studies (pre-school children: under 5 years of age)
No relevant clinical studies were identified.
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
1.2.3.2. Included studies (children and young people aged 5 to 18)
Six randomised trials across 9 papers were included in the review; 139, 197, 206, 207, 257, 349, 378, 470, 691 these are summarised in Table 60 below. Evidence from these studies is summarised in the clinical evidence summary tables below
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
The study results were not meta-analysed as the sequence of treatments in each study was different.
1.2.3.3. Excluded studies
See the excluded studies list in appendix I.
1.2.3.4. Summary of clinical studies included in the evidence review
See appendix D for full evidence tables.
1.2.3.5. Included studies (adults)
One study was included in the review; 134 this is are summarised in Table 61 below. Evidence from these studies is summarised in the clinical evidence summary below (Table 69).
See also the study selection flow chart in appendix C, study evidence tables in appendix D, forest plots in appendix E and GRADE tables in appendix F.
The study compared guanfacine to placebo in people who had a sub-optimal response to CNS stimulants including lisdexamfetamine, amphetamine/dextroamphetamine or methylphenidate.
1.2.3.6. Quality assessment of clinical studies included in the evidence review
1.2.3.6.1. Clinical evidence (children under 5)
No evidence was found.
1.2.3.6.2. Clinical evidence (children and young people aged 5 to 18)
See appendix F for full GRADE tables.
1.2.3.6.3. Clinical evidence (adults)
1.2.4. Economic evidence
1.2.4.1. Included studies
1.2.4.1.1. 2008 guideline literature
No studies were identified with the relevant comparison for this review.
1.2.4.1.2. Published literature
Seven health economic studies were identified with the relevant comparison and have been included in this review. 188,332,221,644,557,395,716 These are summarised in the health economic evidence profiles below (Table 70, Table 71, Table 72, Table 73) and the health economic evidence tables in appendix H.
Two of these studies compare an atomoxetine treatment algorithm with standard care or no treatment in subgroups of children with ADHD who have either failed stimulants, or are averse or contraindicated to them, in keeping with the populations of this sequencing review. Hong 2009332 is a different version of Cottrell 2008188 model but is thought to be sufficiently different and is presented as a separate study. Subgroups from these studies that were stimulant naïve are reported in the pharmacological effectiveness review.
Three studies compare types of extended release methylphenidate with immediate release methylphenidate in children who are responding sub-optimally to immediate release methylphenidate because of inadequate medication intake. Van der Schans 2015644 and Schawo 2015557 are different versions of the Faber 2008221 model but are thought to be sufficiently different and are presented as separate studies.
Lachaine 2016395 compares guanfacine extended release added as an adjunct to long-acting stimulants with long-acting stimulants alone in children who are only partially responding to the stimulants.
Finally Zimovetz 2016716 compares Lisdexamfetamine with Atomoxetine in children who had an inadequate response to Methylphenidate.
See also the health economic study selection flow chart in appendix G.
1.2.4.2. Excluded studies
No health economic studies that were relevant to this question were excluded due to assessment of limited applicability or methodological limitations.
See also the health economic study selection flow chart in appendix G.
1.2.5. Summary of studies included in the economic evidence review
Subgroup 3 of the Cottrell188 study, and the subgroup presented from the Hong332 study, have similar interventions (atomoxetine followed by no treatment compared to no treatment, and atomoxetine compared to no treatment, respectively), yet they have quite different ICERS. One reason for this is that the cost of atomoxetine in the Hong study, which is European, is around twice the cost atomoxetine in the Cottrell study, which might explain why the incremental cost in Hong is about twice that of Cottrell. One concern the committee had abaout the Cottrell and Hong studies was that the studies assumed atomoxetine did not have an insomnia side effect, which the commitee believed was an underestimate. Had this been included in the Cottrell study, it may have had some effect on the result, but it is uncertain if it would have such a large effect as to increase the ICER above the NICE threshold.
The studies comparing extended release methylphenidate to immediate release methylphenidate all have results showing extended release methylphenidate is cost effective, but they can vary from showing the intervention is dominant to having an ICER of around £10,000. This could be explained by the fact that the Van der Schans and Schawo studies are updating the Faber model and therefore there are some differences between all three studies. Faber for example has different health states for the intervention and comparator arm, whereas Van Der Schans and Schawo do not. In the Faber paper there was no suboptimal state in the comparator arm, instead there was a non-compliance state which had the same costs attached as the optimal state, meaning that there might have been lower costs in the comparator arm in that study leading to a larger incremental cost for consultations and other intervention costs, than in van der Schans. However the incremental medication costs are larger in the Faber model, as MPH OROS is around 5 times more expensive than MPH IR. It is less than 4 times more expensive in the Van der Schans study. Therefore there are many trade-offs taking place affecting the total incremental costs of the studies.
The utilities are from different sources in all the papers, and are much closer together in the Faber study, helping to explain why the incremental QALY is smaller in that study.
The medication costs are lower for the medikinet/Equasym arm compared to MPH OROS and this alongside the savings from the resource use (because more people are ‘optimal’ compared to IR MPH) is why there is a cost saving of £449 in the Van Der Schans study.
In the Schawo paper, the transition probabilities are very different to Faber and Van Der Schans. Transitions that were not in Faber like restarting treatment after it is stopped are included and this is more so in the OROS arm, so there are higher costs of the other interventions aside from medication in the IR MPH arm which are expensive, and could explain the very large cost saving compared to the other studies. There is not a breakdown of total costs in the Schawo paper which might have provided more detail.
1.2.5.1. Unit costs
Please see section 1.1.4.4 for an illustration of the costs of the different medications.
Note that some of the clinical data identified for this question involves adding adjuncts to existing medication rather than changing medication, which would incur higher drug costs.
1.2.6. Resource impact
We do not expect recommendations resulting from this review area to have a significant impact on resources.
1.2.7. Evidence statements
1.2.7.1. Clinical evidence statements
- No quality of life data was found for any age group in this evidence report.
- No clinical evidence was found in the pre-school children age group for any interventions
Methylphenidate versus placebo (augmentation of atomoxetine)
- No clinical difference for discontinuation due to adverse events and serious adverse events (1 study very low quality, children and young people).
Lisdexamfetamine versus placebo (augmentation of CNS stimulants)
- Clinical benefit of lisdexamfetamine dimesylate for a combined ADHD total, inattention and hyperactivity symptoms and CGI-I outcome (1 study very low quality)
- No clinical difference was found for adverse events leading to hospitalisation/death/disability (1 study very low quality, children and young people)
Lisdexamfetamine versus atomoxetine (substitution for methylphenidate)
- Clinical benefit of lisdexamfetamine compared to atomoxetine for investigator rated ADHD total, hyperactivity and inattention symptoms (1 study low quality)
- No clinical difference for discontinuation of treatment due to adverse events or adverse events leading to hospitalisation/death/disability (1 study low quality, children and young people), or behavioural outcomes (1 study moderate quality), and CGI-S (1 study moderate quality, children and young people).
Guanfacine versus placebo
- Clinical benefit of guanfacine for CGI-I (1 study low quality, children and young people)
- Clinical harm of methylphenidate in adverse events leading to hospitalisation/death/disability (1 study very low quality, children and young people)
- No cilinical difference for ADHD total, inattention and hyperactivity symptoms (1 study very low quality, adults), CGI-S (1 study very low quality, adults), discontinuation due to adverse events (1 study very low quality, children and young people) and CGI-S and adverse events leading to hospitalisation/death/disabilities (1 study very low to low quality, adults)
Clonidine versus placebo (augmentation of CNS stimulants)
- No clinicall difference in investigator rated ADHD total, inattention and hyperactivity symptoms and no clinical difference in discontinuing treatment due to adverse events (1 study very low quality, children and young people)
Risperidone and parent training versus placebo (augmentation of methylphenidate)
- In children and young people there was a clinical benefit of risperidone for parent rated and teacher rated ADHD total symptoms (1 study moderate to low quality), parent and teacher rated ADHD inattention symptoms (1 study moderate quality), ODD DSM-IV (parent rated, 1 study low quality)
- In children and young people there was clinical harm of risperidone for teacher and parent rated ADHD hyperactivity symptoms (1 study low to moderate quality)
- No clinical difference for ADHD inattention symptoms (1 study low quality, children and young people) and teacher rated and parent rated behavioural outcomes (2 studies, moderate to very low quality)
1.2.7.2. Health economic evidence statements
- One cost-utility analysis found that for treating ADHD in children:
- –
In stimulant failed patients, a sequence of Atomoxetine followed by IR-DEX followed by no treatment was cost effective compared to the same sequence without atomoxetine (ICER: £14,945)
- –
In stimulant averse (exposed) patients, a sequence of atomoxetine followed by IR-MPH (or XR-MPH) followed by IR-DEX followed by no treatment was cost effective compared to the same sequence without atomoxetine (ICER: £15,878 if IR-MPH and £14,169 if XR-MPH)
- –
In stimulant contraindicated (exposed) patients, a sequence of Atomoxetine followed by no treatment was cost effective compared to no treatment alone (ICER: £12,370)
- One cost-utility analysis found that Atomoxetine was cost effective compared to no treatment at a threshold of £30,000 per QALY gained for treating ADHD in children who have failed stimulants, but was not cost effective at a threshold of £20,000 per QALY gained (ICER: £21,528). This analysis was assessed as partially applicable with potentially serious limitations.
- One cost-utility analysis found that OROS MPH was cost effective compared to IR-MPH for treating ADHD in children with sub optimal symptom control from IR-MPH because of incorrect medication intake (ICER: £10,161). This analysis was assessed as partially applicable with potentially serious limitations.
- One cost-utility analysis found that for treating ADHD in children;
- –
OROS MPH was cost effective compared to IR-MPH in children with sub optimal symptom control from IR-MPH because of poor compliance (ICER: £1,879).
- –
Medikinet CR/Equasym XL was dominant (less costly and more effective) compared to IR-MPH in children with sub optimal symptom control from IR-MPH because of poor compliance
- One cost-utility analysis found that OROS MPH was dominant compared to IR-MPH for treating ADHD in children with sub optimal symptom control from IR-MPH because of incorrect medication intake. This analysis was assessed as partially applicable with very serious limitations.
- One cost-utility analysis found that Guanfacine extended release (GXR) + long-acting stimulant was cost effective compared with long-acting stimulant monotherapy for treating ADHD in children who are partial responders to long acting stimulants (ICER: £13,321). This analysis was assessed as partially applicable with potentially serious limitations.
- One-cost-utility analysis found that Lisdexamfetamine was cost effective compared to Atomoxetine for treating ADHD in children who had an inadequate response to methylphenidate (ICER: £1,586). This analysis was assessed as directly applicable with potentially serious limitations.
1.3. The committee’s discussion of the evidence for pharmacological efficacy
This review should be read alongside Evidence reports; D: Safety of pharmacological treatment and F: Combination treatment. See evidence report F for the committee’s discussion on when to decide on which treatment approach to take (pharmacological or non-pharmacological).
1.3.1. Interpreting the evidence
1.3.1.1. The outcomes that matter most
The committee considered quality of life, ADHD symptoms, CGI assessment of response and serious adverse events to be critical outcomes. ADHD symptoms were separately considered as total, hyperactivity and inattention subscales. The committee did not prioritise any one subscale. ADHD symptoms were separately considered when reported by self, parent, teacher and investigator. The committee considered that all had their merit but that symptoms reported by teacher or investigator were likely to be the most objective assessment of effect because even if the trials were blinded, parents might have been aware of the drug or placebo status, given the effect profile of some of the stimulant medication used for ADHD.
The committee considered intervention related discontinuations, serious adverse events, behavioural/functional measures, emotional dysregulation and academic outcomes to be important outcomes.
The committee recognised the importance of evaluating in detail the adverse events reported for pharmacological treatments and evidence report D explores further the potential impacts of the short and long term adverse effects of pharmacological interventions. All the outcomes in the adverse effects review were considered to be critical for supporting decision making about drug choice and initiating treatment. The outcomes were; total number of participants with an adverse event, all-cause mortality, suicide or suicidal ideation, cardiac mortality, cardiac events including tachycardia/palpitations (defined by >/120bpm) or systolic or diastolic blood pressure changes, substance misuse, abnormal growth (height and weight), increase in seizures in people with epilepsy, psychotic symptoms, disturbed sleep, liver damage, increased tics, tremors congenital defects amongst people who are pregnant, sexual dysfunction.
1.3.1.2. The quality of the evidence
The quality of the evidence for this review ranged widely between age groups and individual medications. The majority of the evidence was moderate or low quality for the more commonly prescribed medications (for example methylphenidate, atomoxetine) whereas for the less commonly prescribed medications (for example clonidine, risperidone) the quality of evidence was predominantly low or very low quality.
In children under the age of 5 there was very little evidence (only comparisons between methylphenidate and placebo, methylphenidate and risperidone and risperidone and placebo) and the majority of it was low or very low quality. There was a greater breadth of evidence in children aged 5 to 18 and adults although the majority of comparisons were between drugs and placebo, there was little in the way of large or high quality studies directly comparing different drugs.
Studies rarely reported quality of life or functional measures but frequently just ADHD symptoms. The committee noted that these were often reported by the people taking the drugs themselves (if adults) or parents who, even if the trials were blinded, might have been aware of the drug or placebo status, given the effect profile of some of the stimulant medication used for ADHD. Some studies did use teacher reports who were less likely to be aware.
1.3.1.3. Benefits and harms
Treatment approach
Evidence report F: Combination treatment evaluates the evidence comparing pharmacological and non-pharmacological treatments and the combination of treatment approaches. The ‘committee’s discussion on the evidence’ section in evidence report F sets out the committee’s reasons for treatment approach for the different age groups. The review in this report focuses on medication choices.
Medication choice
As undertaking a network meta analysis was not possible to combine all the clinical data in any of the age groups (see the methodology chapter for further details), the committee had the difficult task of evaluating the different pairwise comparisons presented to them and trying to draw conclusions on both the direct but also indirect relationships between drug treatments. In terms of the pathway of drugs that were recommended for all the age groups the committee agreed that stimulants are effective against placebo, and in clinical practice are the most commonly used ADHD treatment and are favoured because of their fast acting nature.
The short term adverse effects of ADHD drugs are well known and this was reflected in the evidence identified in this review and in Evidence report D. A lot of people taking ADHD medication do report short term adverse effects (for example, sleep difficulties and weight loss) that can be troublesome and impact on adherence to treatment. Careful initiation and titration of medication is important to address these issues. Although adverse effects are commonly reported the drugs reported here appear to be safe at least in the short term with very few serious adverse events reported. There is a lack of information on the long term use of medication for ADHD and particular there are concerns about the long term impact of stimulants on children and young people’s growth.
In summary, the evidence on adverse events is lacking; the quality of the evidence is mostly short term and of low quality, there is lack of good quality long term data and there is a scarcity of trials comparing drugs. The committee noted that when comparing the adverse events of the different drugs there is an absence of evidence and this is not evidence of the equivalence of the adverse events (or an absence of events) across the treatments. The committee based the treatment recommendations on the limited evidence base, their experience of the benefits and harms of treatment and through consensus.
Formulation choice
There are short and long acting formulations of stimulants. There are many circumstances to consider when deciding whether a short or long acting formulation of methylphenidate is used. From the experience of the committee; most clinicians would tend to use the long acting formulation in school children but may titrate with short acting to assess adverse effects and often a mix of short and long acting is used according to the person’s needs. A direct comparison of the two preparations did not show any differences in effectiveness or adverse effects. A modified release formulation can provide more stability in symptom control throughout the day, and also can help prevent the stigma associated with ADHD compared to if children have to take multiple tablets per day necessitating going to the ‘office’ in front of peers for example. Therefore there may be a wider impact on quality of life than only through control of symptoms. For these reasons the committee stated in the recommendation that stimulants in either formulation can be offered.
1.3.1.3.1. Children under the age of 5
The committee agreed that there was insufficient evidence to justify routine use of medication in this age group. The committee discussed at length the appropriateness of recommending stimulants for very young children. The committee noted that there is a very high non acceptance of pharmacological treatments in the under 5 years age group and this is reflected in the high dropout rates in some of the studies. The committee were aware of concerns about the impact of stimulants on the growth and development of young children, particularly the theoretical concern related to the impact of methylphenidate on the growing brain; however, they did not find any evidence that reflected this concern. The committee also acknowledged other reports of the positive effect long term impact of stimulants on the brain. Drawing on their experience the committee discussed how untreated ADHD could have long lasting negative impacts on a child’s life.
Taking into account the uncertainty around the evidence in this population the committee agreed that if ADHD symptoms are having a persistent significant impairment across domains after non-pharmacological approaches have been implemented and reviewed it is then only in this context that medication should be considered, The committee were clear that this would be very unusual in this age group and should only be considered having carefully reviewed the diagnosis and other options. The committee reinforced this with a recommendation that emphasised medication should only be considered in the context of an ADHD service with specialist experience of young children.
1.3.1.3.2. Children aged 5 years and over and young people
There is a larger evidence base in this age group compared to children aged under 5 and this shows a benefit of medication compared to placebo. As outlined above the short term adverse effects of medication are well known and can be managed with the careful initiation and titration of a drug. The committee acknowledged and discussed in detail the concerns about recommending medication for ADHD symptoms in children and young people. The committee were aware of concerns about the impact of stimulants on the growth and development of children, particularly the theoretical concern related to the impact of methylphenidate on the growing brain; however, they did not find any evidence that reflected this concern, the committee also acknowledged other reports of the positive effect long term impact of stimulants on the brain.
Drawing on their experience the committee discussed how the impact of unrecognised and untreated ADHD can be serious and far reaching. People report negative impacts on academic achievement, commonly underachieving at school, poorer social relationships and participation in life activities both leisure and work. People with ADHD are over represented in criminal justice systems, have more physical accidents including with cars and have a higher risk of addictive behaviour with resultant impact.
Taking into account the evidence about the effectiveness of medication, the known impacts of adverse events and the concerns about growth in children the committee recommended that ADHD group support for parents and carers and environmental modifications should be the first line of treatment. If a child or young person is still experiencing persistent impairment in at least one domain then they should be offered medication having carefully reviewed the diagnosis and undertaken baseline assessments and with regular reviews.
1.3.1.3.3. Medication choices for children aged 5 to 18 and adults
The committee noted that the drugs that showed a most convincing clinically important benefit from the evidence in this review were methylphenidate, atomoxetine, lisdexamfetamine, dexamfetamine and guanfacine. Although other drugs (for example venlafaxine, modafinil), showed benefits for some outcomes, they were generally less consistent, less evident in the teacher/investigator rated outcomes prioritised by the committee and supported by smaller, lower quality trials. The committee therefore chose not to specifically recommend the use of any other medication but instead to advise that any other medication should only be considered in the context of specialist ADHD services.
The committee noted that stimulant medication generally has a faster onset compared to non-stimulant medication. This means that in terms of first line drug treatment, starting with stimulant medication (methylphenidate, in age 5–18 and lisdexamfetamine or methylphenidate in adults) allows for healthcare professionals to quickly determine if a person is responsive to a first line treatment and move on to other options appropriately. Starting with non-stimulant medication (for example atomoxetine) would result in all people with ADHD undergoing a longer period of titration and waiting to determine if they are responsive to their first medication option.
Lisdexamfetamine is a pro-drug of dexamfetamine, and has a longer effect profile. The committee agreed, based on consensus, that the only situation in which they would recommend dexamfetamine would be when the person has responded very well to lisdexamfetamine but is unable to tolerate its longer effect profile.
The committee noted that of the non-stimulant medication atomoxetine and guanfacine were the non-stimulant drugs that had the largest and most convincing evidence base demonstrating a clinically important benefit. The committee noted that atomoxetine is more widely used currently and that the evidence showing a benefit of atomoxetine compared to placebo was stronger than that showing a benefit of guanfacine compared to placebo. There outcomes showing a clinically important benefit for guanfacine compared to placebo were generally based on parent ratings as opposed to teacher ratings, unlike atomoxetine. There was one trial directly comparing atomoxetine with guanfacine which generally showed a clinically important benefit of guanfacine compared to atomoxetine.
1.3.1.3.4. People with ADHD and co-existing conditions
The committee noted there was no evidence to support deviating from the usual ADHD treatment ADHD pathway in people with ADHD and co-existing conditions (for example, anxiety disorder, tic disorder or autism spectrum disorder). The exceptions were people who misused substances and people who are experiencing an acute psychotic or manic episode. Historically clinicians have been hesitant to use stimulant medication in people with co-existing conditions, such as anxiety disorder, tic disorder and autism spectrum disorder, for fears of worsening their co-existing conditions. However there was no evidence identified in this review or the pharmacological adverse effects review to support this. It was noted there was a dearth of evidence evaluating the impact of ADHD treatments on people with co-morbidities, either the groups were not distinguished within the analysis or these groups had been excluded from the trial. The committee’s consensus view was that healthcare professionals should consider the same medication choices for these populations, although they should consider the individual circumstances and have slower dose titration and more frequent monitoring.
The committee agreed that prescribing stimulant medication to people with ADHD with a history of/at risk of stimulant misuse or stimulant diversion is challenging. The committee recommended that healthcare professionals are generally cautious about prescribing stimulant medication in this context, although it should not be an absolute contraindication.
Healthcare professionals should also consider if less readily abused forms of stimulants (e.g. modified release) or non-stimulant medication (e.g. atomoxetine or guanfacine) may be a better option for these people.
The committee discussed, based on their own experience the treatment of people who are currently experiencing an acute psychotic or manic episode. The GC noted that healthcare professionals should not treat ADHD symptoms in someone who is acutely psychotic and that management of the acute condition should take precedent. New ADHD medication should not be started in this context and any existing ADHD medication should be stopped until the acute psychotic or manic episode has resolved.
1.3.2. Cost effectiveness and resource use
One economic evaluation was included from the previous guideline (King 2006). This was a Health Technology Assessment including an original economic model looking at different 3 treatment strategies, with clinical effect based on a Network Meta-Analysis, for a child population. This is partially applicable because of the population as it includes some studies in the network meta-analysis that were only in a responder group. Limitations include no dependence assumed between different drugs in the sequence, and only a small sample of clinical evidence was used. The results of this are discussed below when talking about dexamfetamine specifically 5 studies that were previously included in the last guideline were selectively excluded because of reasons including; prior to the date cut-off, outcomes used, and perspective.
Three new economic evaluations were identified for this question (two in children and one in adults), but only some of the subgroups included in the children studies fulfil the population criteria for this question.
Cottrell 2008 used a decision model to compare an algorithm with atomoxetine as first line treatment versus an algorithm of standard treatment (the same sequence without atomoxetine) in different child subgroup populations (included for this question are those who are stimulant naïve, or stimulant contraindicated (naïve)). The other subgroups of patients who have tried and failed stimulants or could not tolerate them are included in the sequencing question. The study found that the interventions in each subgroup of the atomoxetine algorithms were cost effective compared to the comparator algorithms. This study was rated as partially applicable because although it was a UK study, it does not use EQ-5D and valuations of the states are based on parents not the general public. It has potentially serious limitations which include; a potential conflict of interest as it is funded by the makers of atomoxetine, methods were sometimes unclear, the effectiveness data is based on some clinical data that has been excluded for this question, and no adverse event costs or other resource use costs included.
The second child study (Hong 2009) adapted the model from the UK study to a Spanish context, however it compared sequences of atomoxetine as first line versus atomoxetine as second line (and did not include dexamfetamine in the sequence). Therefore the interventions were different, and it only looked at some of the subgroups that the UK paper looked at (again only some of which are included in this review; stimulant naïve patients, and stimulant naïve patients with contraindications), therefore the models were thought to be sufficiently different to be included as separate studies. Note that although these studies compare sequences in different ways, they are both essentially looking at which drug you should start with. This study found that the intervention sequences were not cost effective. This is most likely due to the higher european prices of the drugs. This study was also rated as being partially applicable with potentially serious limitations as it is an update of the Cottrell study and therefore has some of the same limitations.
The single study identified in adults (Zimovetz 2017) used a decision model to compare Lisdexamfetamine (LDX) with Atomoxetine (ATX) and extended release Methylphenidate (ER-MPH). This study found that LDX dominated both ATX and ER-MPH. This study was rated as directly applicable because it was from a UK NHS perspective and used EQ-5D data for QALYs. It has very serious limitations such as a potential conflict of interest as it is funded by the makers of a LDX product, also no additional treatment was assumed following non response/discontinuation. It conducted a network meta-analysis for treatment effect and discontinuations and some studies in their NMA were not included in the guideline clinical review. As the results particularly of the LDX vs MPH comparison were very close together in terms of outcomes (cost difference of £9) then changes to the model may well change the conclusions. Therefore cost effectiveness of LDX vs MPH or ATX is potentially uncertain.
Costs of the interventions identified from the clinical review and the main drugs used were presented. Modified release preparations of methylphenidate are more expensive than the short acting version. Other drugs that are more expensive are guanfacine, atomoxetine, dexamfetamine, and lisdexamfetamine. The stimulants and atomoxetine are the main drugs used for ADHD. Guanfacine is relatively new and only licensed for children who are not suitable for stimulants.
It had become apparent during discussions that one drug in particular had drastically increased in price since the previous guideline – dexamfetamine. Costing the dexamfetamine dose used in King 2006 showed that this has increased in price by over 800%. Two included economic evaluations that included this drug as part of the sequence were King 2006 and Cottrell 2008. As this information is likely to impact the cost effectiveness of the interventions, the health economist replicated the King 2006 model by updating only the drug prices as an informal exercise to see what this impact might be. This confirmed that the most cost effective strategy was now Methylphenidate IR – Atomoxetine – Dexamfetamine – No treatment, rather than the base case result from the study of; Dexamfetamine – Methylphenidate IR – Atomoxetine – No treatment. The increased price of Dexamfetamine means it is no longer cost effective first or second line even though it has a higher response rate and fewer withdrawals than the other drugs. The increased cost is outweighing the additional benefit.
With regards to the Cottrell study that also includes dexamfetamine in its sequences, this was more difficult to replicate form the paper as it was a markov model and the paper wasn’t clear enough about the model structure. We can however make assumptions about what the impact of a price change of this drug would be; The intervention arm for each subgroup always had atomoxetine first followed by other treatments, and the comparator sequence was the same sequence but without atomoxetine. Because of this, dexamfetamine will always be closer to the front of the sequence in the comparator arm. Meaning that in the comparator arm, more people will be on dexamfetamine because you only go on to the next treatment if you fail the previous one. Therefore a dexamfetamine price increase will increase the total cost of the comparator arm more than the total cost of the intervention arm, therefore making the incremental cost smaller and the intervention arm more cost effective. It may even make the intervention cost saving.
As well as the interventions themselves, other resource should be considered such as appointments with staff including GPs, psychiatrists, and paediatricians. Some interventions already used in current practice such as atomoxetine are slow to act compared to stimulants, and it can take weeks for any improvement to be seen. This implies that atomoxetine may have more infrequent monitoring in the initial phase compared to stimulants because of the duration of action. Adverse events also need to be monitored which affect resource use.
If UK evidence is prioritised higher weight would be given to King 2006, Cottrell 2008, and Zimovetz 2017. The first two studies tell us that different sequences are cost effective that still involve the 3 main drugs - atomoxetine, dexamfetamine (or lisdexamfetamine, that has the same active component), and methylphenidate, and the study in adults informs that lisdexamfetamine could be more cost effective than atomoxetine and extended release methylphenidate. Overall a mixed picture, but these are the 3 that have been recommended previously and remain at the top of the treatment algorithms in this update. Sequences of treatment are discussed in more detail below.
1.3.2.1.1. Cost effectiveness and resource use for children under the age of 5
See the non-pharmacological review and rationale for more information about these recommendations.
For pre-school children, drug treatment was previously not recommended. The GC discussed that there are some cases where a pre-school child’s ADHD could be particularly severe that drug treatment might be initiated. The GC therefore agreed that they would add a caveat to make clear that only after parent training has been unsuccessful (if still causing severe impairment) should a tertiary care specialist be contacted for further opinion on the initiation of drugs.
It was also discussed how the age range for pre-school children should be defined more specifically, and this was agreed to be under the age of 5. Aged 5 and over would be school aged children. This may have resource implications if traditionally school age was defined as 6 and above in the previous guideline. The clinical studies included for pre-school children go up to the age of, and including, 6 years old. If the threshold for treatment with medication is being lowered then this could mean there may now be additional children that could be using interventions for ADHD, which would have a resource impact. It is however largely practice that as school age in England is 5 years old that most practice is to use medication in children aged 5 and above if appropriate.
1.3.2.1.2. Cost effectiveness and resource use for children aged 5 to 18
Taking all of this information alongside the economic evidence;
The study on adults showed that LDX was cost effective compared to atomoxetine or extended release methylphenidate. Assuming this could be extrapolated to a child population, and taken together with the clinical evidence on the effectiveness of stimulants led the committee to consider that lisdexamfetamine should also be a first line option alongside methylphenidate preparations but recognised that the licensing status of the drugs prevented this. If stimulants cannot be tolerated or trials of methylphenidate and LDX have not worked (including trying higher doses) then the next line of drug treatment was decided as atomoxetine or guanfacine (in children only). UK economic evaluations showed that; atomoxetine was cost effective first line (Cottrell study), and also second line (following IR-MPH – King study), and as mentioned above not cost effective compared to lisdexamfetamine.
All of this is a mixed picture, but again taking it together with the clinical evidence that atomoxetine is no better than methylphenidate, is more expensive and takes longer to work led the committee to recommend atomoxetine after stimulants in the ordering of treatments. Guanfacine was not available at the time of the previous guideline. Clinical evidence was identified to show that guanfacine and extended release guanfacine (only extended release guanfacine is listed in the BNF at this time and licensed for children) had clinical benefit compared to placebo. One large clinical study found that guanfacine had a clinical benefit compared to atomoxetine but the committee noted the greater number of studies about atomoxetine than guanfacine and they were of higher quality. Members of the committee agreed there was currently more clinical experience with atomoxetine than guanfacine. No economic evidence was found for guanfacine in this question. However the further down the treatment pathway we go the smaller the population that will be using those treatments because it is only those people who cannot tolerate or do not respond to the previous treatments in the sequence. At this point if someone has failed the treatments thus far (at least one stimulant and one non-stimulant), anything else should only be prescribed in the context of tertiary services or at minimum a second opinion should be obtained from a healthcare professional with specialist knowledge of ADHD.
For most subgroups of people with ADHD and a co-existing condition, the sequence is the same, although there are exceptions where the committee wanted to alter the sequence depending on the co-morbidity or risk factors such as risk of misuse. These were consensus based recommendations.
The committee consensus was that drug treatment would currently be offered to school age children as it is considered to be more effective than no treatment as demonstrated by the clinical review. And also as demonstrated by some of the cost effectiveness evidence (e.g. the sequence from Cottrell that compared atomoxetine followed by no treatment versus no treatment which had an ICER of under £12,000 per QALY). A discussion on pharmacological treatment versus other treatments (e.g. non-pharmacological) can be found in the combination review.
It is accepted that there is a lack of longer term safety data on pharmacological treatments. Economic evaluations included adverse events or discontinuations, but these tend to be short term events. These may have a longer term cost or quality of life impact dependent on what these longer term adverse events might be, which could impact cost effectiveness. Recommendations made in the adverse events review ensure that people with ADHD are regularly followed up and monitored in order to ensure that the treatment the patient is taking is the right choice for them.
Although offering medication to children aged over 5’s years and young people is generally already current practice, the previous guideline separated those with moderate impairment from those with severe impairment, and drug treatment was only offered first line to those with severe impairment. It was not possible in this update to divide the populations by severity. The committee recommended offering medication to children and young people over 5 years old if their ADHD symptoms are having a persistent significant impairment on at least one domain of their everyday life even after environmental modifications. This may include some people who were previously categorised as being of moderate severity from the classification of the previous guideline. There is difficulty in practice in defining the severity of ADHD and an element of clinician judgement is needed. The opinion of the committee was although this may mean more people could receive drugs than the previous guideline, in practice the help-seeking population are likely to be mostly made up of children who meet the criteria for more severe ADHD rather than moderate. In addition, by definition ADHD (whether mild, moderate, or severe) involves impairment, and thus by using the definition ‘persistent significant impairment’ in the recommendation, and stating that medication should also only be offered after ADHD support and environmental modifications have been implemented and reviewed, suggests that medication would only be offered to those with more severe enduring impairment. Hence overall the committee did not feel that there would be a significant impact on practice in terms of the overall population being prescribed medication.
1.3.2.1.3. Cost effectiveness and resource use for adults aged over 18
The pathway begins the same as for children by recommending stimulants as first line, for adults this is either methylphenidate or lisdexamfetamine as the committee consensus was that the clinical evidence supports either and offering a choice is more helpful in practice. As mentioned previously, one economic evaluation for adults was identified comparing lisdexamfetamine to extended release methylphenidate and atomoxetine, and found that lisdexamfetamine was likely to be dominant. The clinical review found that both formulations of methylphenidate were effective compared to placebo. Lisdexamfetamine was also found to have benefit compared to placebo. There weren’t as many direct comparisons of different drugs for adults however as there were for children.
Dexamfetamine was again placed after lisdexamfetamine. This was mainly due to the increase in price of the drug since the previous guideline. As lisdexamfetamine is a prodrug of dexamfetamine, it has a longer effect profile so can avoid someone taking multiple doses per day. This can help reduce stigma associated with ADHD when multiple doses have to be taken throughout the day. Lisdexamfetamine is also a fairly new drug not available at the time of the last guideline. For adults in particular there is a much larger price difference between dexamafetamine and lisdexamfetamine because much higher doses of dexamfetamine are taken for adults which is driving its higher price, and as more than one tablet a day is taken the number of tablets needed per day means more tablets are required overall.
The licensing around some of the drugs was also a factor in determining their placement in the pathway. Atomoxetine for example is only licensed in adults if they had childhood symptoms. Therefore atomoxetine was a second line treatment for adults, followed by a referral to tertiary services before guanfacine could be prescribed in adults because it is not licensed for adults.
The wording of the recommendation was altered to ensure that those receiving drugs will be those for whom their ADHD has a significant impact on at least one domain of their everyday life after environmental modifications. The opinion of the committee was that not all adults with ADHD (those considered moderate or severe from the last guideline) currently receive drug treatment, and so there is unlikely to be a resource impact from this recommendation.
1.3.2.1.4. Cost effectiveness and resource use summary
The sequences of drugs involved had to be based on a number of different factors; the clinical evidence, the economic evidence, cost considerations, side effect profiles, consensus, and it was challenging to bring all the information together when faced with lots of pairwise comparisons and models comparing different sequences and have to make indirect comparisons between treatments. There is uncertainty as to which sequence of drugs is the most cost effective because some of the economic evidence identified is conflicting. It is also important to remember that there is a distinction between the continuous outcomes that the clinical review is using for decision making, and the outcomes that tend to be used in models which are dichotomous outcomes. Ideally a network meta-analysis using the clinical evidence could have informed an economic model but there is data lacking on specific sequences of treatment that would be needed for dependent probabilities of response.
1.3.3. Other factors the committee took into account
Alongside the recommendations on medication and throughout the guideline the committee have emphasised the importance of having a good relationship with the person with ADHD (or their parents and carers) and making treatment decisions together with as much information as possible. It is important that anyone that receives medication is closely and carefully monitored The committee agreed that effective strategies for reviewing treatment, monitoring behavioural response and managing adverse events were critical when deciding on and continuing with treatment options and improving adherence to treatment in people with ADHD. The committee acknowledged the variation in the implementation in follow up and monitoring across the UK. They referred to the recommendations from the original guideline that recommended shared care arrangements with primary care. Some of the committee noted that in their experience specialist nurses undertook this role.
1.4. The committee’s discussion of the evidence for sequencing pharmacological treatment
1.4.1. Interpreting the evidence
1.4.1.1. The outcomes that matter most
The committee considered quality of life, ADHD symptoms and CGI assessment of response to be critical outcomes. ADHD symptoms were separately considered as total, hyperactivity and inattention subscales. The committee did not prioritise any one subscale. ADHD symptoms were separately considered when reported by self, parent, teacher and investigator. The committee considered that all had their merit but that symptoms reported by teacher or investigator were likely to be the most objective assessment of effect.
The committee considered intervention related discontinuations, serious adverse events, behavioural/functional measures, emotional dysregulation and academic outcomes to be important outcomes.
1.4.1.2. The quality of the evidence
Most outcomes were graded as low or very low quality. The downgrades tended to be for a combination of risk of bias and imprecision. Risk of bias was assessed as high or very high for a number of reasons though most commonly due to incomplete reporting of blinding methodology utilised in the study. The other influential risk of bias domains were selection of participants, and incomplete outcome data. Imprecision was serious for over ninety per cent of the outcomes.
Some treatment comparisons had outcomes of higher quality; lisdexamfetamine, dimesylate versus atomoxetine had some outcomes considered to be of moderate quality. Risperidone versus placebo had some outcomes considered to be of moderate quality and one of high quality.
There were 24 specific treatments and additionally six separate classes (for example SSRIs) of treatments detailed in the protocol. There were zero randomised controlled trials (RCTs) in the pre-school children strata, six RCTs included in the children and young people strata and one RCT in the adults strata. There were many treatments or combinations of treatments combined with additionally previously received medication for ADHD to which participants were intolerant or non-responsive not covered in these included trials.
The committee noted that there was only a single very small trial assessing the impact of combined methylphenidate and atomoxetine, reporting very low quality outcomes. This was highlighted as an area where further research would be important.
1.4.1.3. Benefits and harms
1.4.1.3.1. Children under the age of 5
In addition to the scarcity of evidence on anything other than methylphenidate no sequencing evidence was found in this age stratum. The committee did not make specific recommendations on the sequence of medication to use in this group as they considered it to be uncommon that medication was used in this age group and recommended it should only be done after seeking expert advice.
1.4.1.3.2. Children and young people aged 5 to 18
Methylphenidate versus placebo augmented on top of previous atomoxetine treatment. No clinical difference was found in terms of discontinuation of treatment due to adverse events or adverse events leading to hospitalisation/death/disability.
Guanfacine in the morning or evening versus placebo augmented on top of previous stimulant treatment. Both morning and evening administration of guanfacine showed no clinical difference in terms of ADHD symptoms and early discontinuation of treatment due to adverse events. There was a clinical benefit for guanfacine morning/evening in terms of the CGI-I score and a clinical harm for guanfacine morning/evening in terms of adverse events leading to hospitalisation/death/disability.
Lisdexamfetamine dimesylate versus atomoxetine where previous methylphenidate treatment was stopped. There was a clinical benefit for ADHD symptoms (investigator rated), ADHD symptoms hyperactivity/impulsivity subscale (investigator rated), ADHD symptoms inattentiveness subscale (investigator rated), Weiss Functional Impairment Rating Scale - Parent Report, and CGI-S improvement. There was no clinical difference in terms of discontinued treatment due to adverse event or adverse events leading to hospitalisation/death/disability.
Risperidone versus placebo where previous methylphenidate treatment was continued. There was a clinical benefit for risperidone in terms of ADHD severity (parent rating) and the corresponding inattention, hyperactivity and impulsivity subscales. This was fairly well matched in the ADHD severity (teacher rating) where there was a clinical benefit for risperidone in terms of overall severity and for impulsivity and inattention subscales. However there was a clinical harm for risperidone for the hyperactivity subscale (teacher rating). There was a clinical benefit for risperidone in the oppositional defiant disorder (ODD) DSM-IV (parent rating), Peer Conflict Scale (parent rating), conduct disorder (CD) DSM-IV (parent rating). There was no clinical difference in terms of ODD DSM-IV (teacher rating), Peer Conflict Scale (teacher rating), CD DSM-IV (teacher rating).
Lisdexamfetamine dimesylate versus placebo where previous methylphenidate treatment was stopped. A clinical benefit was found for lisdexamfetamine dimesylate for clinical response and no clinical difference for adverse events leading to hospitalisation/death/disability.
Clonidine versus placebo where previous stimulant treatment continued. There was a clinical benefit for clonidine for ADHD symptoms (investigator rated) and both inattention and hyperactivity/impulsivity subscales. There was no clinical difference for CGI-I and discontinued treatment due to TEAE.
1.4.1.3.3. Adults over 18
Guanfacine versus placebo where previous CNS stimulant treatment continued. No clinical difference was found for ADHD symptoms or adverse events leading to hospitalisation/death/disabilities.
1.4.1.3.4. Summary
The committee considered that the body of evidence in general did not support the use of combined therapies other than in the very specific situations outlined in the recommendations for risperidone. The majority of the sequencing trials included in this review were smaller and varied greatly; this meant they couldn’t be combined to increase power. As a whole the evidence was of lower quality than the trials assessing the effectiveness of medication, they also predominantly compared adding/substituting with a new medication and not adding/substituting with placebo. Therefore the committee broadly based their recommendations around the sequence of medication on the body of efficacy evidence in the general pharmacological efficacy review.
The committee discussed how long to wait to determine whether or not treatment was successful. Different medications have different expected times to onset of effect and may also require titration to an optimal tolerated dose. The committee suggested 6 weeks as a starting point at which point they would hope to see some benefits, in ADHD symptoms even if not yet in terms of overall impact, from effective medication. A shorter time point may not insure that people have a truly adequate trial of medication but a longer time point would risk leaving people on ineffective medication for a prolonged period. The choice of 6 weeks was a consensus recommendation based on the committee’s experience and not on evidence identified in these reviews. The committee also noted that the expected time to efficacy may vary depending on the circumstances of an individual being treated (for example if trial period is occurring during a particularly challenging period of their personal or work life).
1.4.2. Cost effectiveness and resource use
Seven economic evaluations (cost utility analyses) were identified for this review question. All were in children. Two of these have already been included in the effectiveness of pharmacological treatments review, however particular subgroups are included here because they were considered to be subgroups that had previously been exposed to stimulant medication and either failed or could not tolerate it. The populations included here from Cottrell 2008 are; stimulant failed patients, stimulant averse (exposed) patients, and stimulant contraindicated (exposed) patients. This compared algorithms with atomoxetine first line with algorithms that did not include atomoxetine, in a 1 year markov model, and found that the intervention arms (that included atomoxetine as first line) were cost effective for all subgroups. The study was rated as partially applicable because it was a UK study with an NHS cost perspective. However it does not use EQ-5D and valuations of the states are based on parents not the general public. It has potentially serious limitations with reasons including; it has a potential conflict of interest, methods were sometimes unclear, effect was based on some data that has been excluded for this question and no adverse event costs or other resource use costs were included.
Hong 2009 was also included in the pharmacological effectiveness review, and one subgroup of stimulant failed patients is included in this review. This is a Spanish adaptation of the Cottrell study, and the intervention compares atomoxetine with no treatment. Atomoxetine was not found to be cost effective here, and this is most likely because of the higher price of the drug compared to the Cottrell study. This study is also partially applicable and with potentially serious limitations, for similar reasons to Cottrell because they are based on the same data.
Three studies compare types of extended release methylphenidate with immediate release methylphenidate in children who are responding sub-optimally to immediate release methylphenidate because of inadequate medication intake. Faber 2008 was a Markov model with a 10 year time horizon. The markov model is preceded by a 2 month primary phase. Patients going into the primary phase are youths with sub optimal symptom control from methylphenidate immediate release, but from this group only those who are responding to immediate release methylphenidate but the treatment is suboptimal due to inefficient exposure because of the multiple daily administration are required go into the markov phase. Staying on IR MPH is then compared to optimal response with OROS MPH (a type of extended release MPH). There are 4 states in each arm (not the same for both arms). The study found OROS MPH to be cost effective. This was rated as partially applicable because it is a non UK study, it uses different but similar discount rates to NICE, and does not use EQ-5D and utilities are not from the public. It has potentially serious limitations such as a potential conflict of interest, a lot of assumptions/inputs from a panel of experts and limited data. Van der Schans 2015 is an updated version of the Faber model using slightly different health states and inputs. It also compares different versions of modified release methylphenidate (OROS MPH, or Medikinet CR/Equasym XL (these two interventions were grouped together)). This study found that MPH OROS was cost effective versus immediate release MPH, but that Medikinet/Equasym was dominant versus immediate release MPH. The Medikinet/Equasym comparator is dominant overall because it is cheaper than MPH OROS and has the same QALYs. The applicability and quality rating given to the study was the same as for Faber 2008. The final of these three studies was Schawo 2015. This was again based on Faber but some structural aspects of the model were slightly different such as a 12 year time horizon and different assumptions about health states. Schawo found that OROS MPH was dominant. This study was also partially applicable with very serious limitations because it makes the most assumptions of the three. The three studies comparing extended release methylphenidate to immediate release have a range of results, although they are all pointing in the same direction, and this is most likely because of a number of structural and data differences in the three models.
Lachaine 2016 is a Canadian study that used a 1 year markov model to compare adding guanfacine extended release onto a long-acting stimulant versus long-acting stimulants alone in children who are only partially responding to the stimulant. This study showed that the addition of guanfacine was cost effective, and was assessed as partially applicable because of the healthcare system with potentially serious limitations as it is only based on a single short term trial and has a conflict of interest as the funders make guanfacine.
The final study was a UK study that used a 1 year decision tree to compare lisdexamfetamine with atomoxetine in children who had an inadequate response to methylphenidate. The study found that lisdexamfetamine was cost effective compared to atomoxetine, and was rated as directly applicable because it is UK, and had potentially serious limitations because similarly to the other studies it is funded by the makers of the intervention and is based on a single short term trial.
No evidence was found in adults.
In summary of the evidence, there is conflicting evidence about atomoxetine, as UK evidence found an algorithm including atomoxetine first line is cost effective, but not when a single line of treatment of atomoxetine is compared to lisdexamfetamine. Extended release methylphenidate versus immediate release in patients with suboptimal response to immediate release methylphenidate was found to be cost effective or dominant. However as they are the same drug, then extended release methylphenidate is essentially only solving the issue of compliance, and if patients were compliant to immediate release methylphenidate then they would be just as effective and immediate release methylphenidate is less costly. A study on guanfacine, although not from the UK, found that it is a cost effective addition. It is important to bear in mind though that augmenting existing treatment with another drug means that the costs of two drugs will apply, and the committee agreed that there was not enough clinical and economic evidence to say that two treatments together might be better than one.
In summary it is difficult to draw conclusions; although there is some UK evidence showing that atomoxetine first line is cost effective (in people who have tried stimulants), there is also have evidence saying that lisdexamfetamine is cost effective compared to atomoxetine in children who are partially responding to methylphenidate (and clinical evidence supports this also). Hence in people who may have tried stimulants before and either cannot tolerate or have failed them, the committee agreed that lisdexamfetamine and atomoxetine are likely to be choices that might be tried next in the pathway. There is no economic evidence directly comparing guanfacine with other treatments, only the Lachaine study which looked at guanfacine as an adjunct to stimulant treatment (versus stimulant treatment alone). More discussion around how the order of the drug treatments in the pathway was decided can be found in the pharmacological effectiveness rationale section above.
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Appendices
Appendix A. Review protocols
A.1. Pharmacological efficacy
A.2. Pharmacological sequencing
Table 76. Review protocol: Sequence of pharmacological treatment
Appendix B. Literature search strategies
The literature searches for this review are detailed below and complied with the methodology outlined in Developing NICE guidelines: the manual, Oct 2014, updated 2017 https://www.nice.org.uk/guidance/pmg20/resources/developing-nice-guidelines-the-manual-pdf-72286708700869. The same literature search strategies were used for the 2 review questions in this review, pharmacological efficacy and pharmacological sequencing.
For more detailed information, please see the Methodology Review.
B.1. Clinical search literature search strategy
Searches for were constructed using a PICO framework where population (P) terms were combined with Intervention (I) and in some cases Comparison (C) terms. Outcomes (O) are rarely used in search strategies for interventions as these concepts may not be well described in title, abstract or indexes and therefore difficult to retrieve. Search filters were applied to the search where appropriate.
Table 78. Database date parameters and filters used
B.2. Health Economics literature search strategy
Health economic evidence was identified by conducting a broad search relating to ADHD population in NHS Economic Evaluation Database (NHS EED – this ceased to be updated after March 2015) and the Health Technology Assessment database (HTA) with no date restrictions. NHS EED and HTA databases are hosted by the Centre for Research and Dissemination (CRD). Additional searches were run on Medline and Embase.
Appendix C. Clinical evidence selection
Appendix D. Clinical evidence tables
D.1. Pharmacological efficacy
Download PDF (4.5M)
D.2. Pharmacological sequencing
D.2.1. Pre-School children (under 6 years of age)
No evidence found.
D.2.2. Children and young people (6–18 years old)
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D.2.3. Adults
Download PDF (185K)
Appendix E. Forest plots
E.1. Pharmacological efficacy
E.1.1. Children under the age of 5
Methylphenidate versus placebo
Figure 4. Behaviour symptoms at 4 weeks (CGAS; 0–100; higher values are beneficial)
Risperidone versus methylphenidate
Risperidone and methylphenidate versus methylphenidate
E.1.2. Children and adolescents (aged 5 to 18)
Immediate release methylphenidate versus placebo
Figure 27. Clinical Global Impressions score of 1 or 2 at 3 to 9 weeks
Figure 29. Discontinuation due to adverse events at 3 to 16 weeks
OROS methylphenidate versus placebo
Figure 42. Clinical Global Impressions – Improvement (score of 1 or 2) at 4 to 7 weeks
Figure 43. Behavioural outcome at 7 weeks (WFIRS-P; high values are beneficial)
Figure 45. Discontinuation due to adverse events at 4 to 7 weeks
IR methylphenidate versus OROS methylphenidate
Figure 50. Clinical global impressions – improvement (score of 1 or 2) at 4 weeks
Lisdexamfetamine versus placebo
Figure 53. CGI-I scores of 1 or 2 at 7 weeks
Figure 55. Behavioural outcomes at 7 weeks (WFIRS-P); 0–3; low values are benficial
Figure 56. Discontinuation due to adverse events at 4–7 weeks
Methylphenidate versus lisdexamfetamine
Figure 58. CGI-I scores of 1 or 2 at 7 weeks
Figure 59. Behavioural outcomes at 7 weeks (WFIRS-P; 0–3; low values are beneficial)
Atomoxetine versus placebo
Figure 82. CGI-I score of 1 or 2 at 4 to 13 weeks
Figure 85. Discontinuation due to adverse events at 3 to 10 weeks
Figure 86. Discontinuation due to adverse events at 3 to 10 weeks
Atomoxetine versus methylphenidate
Atomoxetine versus guanfacine ER
Figure 95. Clinical global impressions – improvement at 10 to 13 weeks; scores of 1 or 2
Figure 96. Discontinuation due to adverse events at 10 to 13 weeks
Guanfacine versus placebo
Extended release guanfacine versus placebo
Figure 105. Clinical Global Impressions
Figure 107. Discontinuation due to adverse events at 5 to 13 weeks
Clonidine versus placebo
Figure 116. Discontinuation due to adverse events at 16 weeks
Clonidine versus methylphenidate
Figure 121. Discontinuation due to adverse events at 16 weeks
Clonidine versus desipramine
Clonidine versus carbamazepine
Desipramine versus placebo
Venlafaxine versus methylphenidate
Risperidone versus placebo
Ariprazole versus placebo
Buspirone versus methylphenidate
Figure 133. Treatment response at 6 weeks (more than 30% reduction in ADHD-RS total scores)
Figure 135. Discontinuation due to adverse events at 6 weeks
Bupropion versus placebo
Figure 139. Discontinuation due to adverse events at 4 to 6 weeks
Bupropion versus methylphenidate
Figure 150. Discontinuation due to adverse events at 6 weeks
Modafinil versus placebo
Figure 154. CGI score of 1 or 2 at 9 weeks
Figure 155. Serious adverse events at 9 weeks
Figure 156. Discontinuation due to adverse events at 9 weeks
Modafinil versus methylphenidate
Melatonin versus placebo
Figure 160. Discontinuation due to adverse events at 4 weeks
Amantadine versus methylphenidate
Methylphenidate and clonidine versus methylphenidate
Figure 166. Discontinuation due to adverse events at 16 weeks
Methylphenidate and clonidine versus clonidine
Figure 169. Discontinuation due to adverse events at 16 weeks
Methylphenidate and clonidine versus placebo
Figure 173. Discontinuation due to adverse events at 16 weeks
Amotoxetine and fluoxetine versus atomoxetine and placebo
Figure 177. Discontinuation due to adverse events at 8 weeks
E.1.3. Adults
Immediate release methylphenidate versus placebo
Figure 181. CGI-I score of 1 or 2 at 7 weeks
Figure 183. Discontinuation due to adverse events at 3–7 weeks
OROS release methylphenidate versus placebo
Figure 184. Quality of life at 8 weeks (Q-LES-Q total sores; 0–80; high scores are beneficial)
Figure 198. CGI-I score of 1 or 2 at 7–13 weeks
Figure 202. Discontinuation due to adverse events at 6 to 13 weeks
Dexamfetamine versus placebo
Figure 206. Treatment response at 6 weeks (CGI-I score of 1 or 2)
Lisdexamfetamine dimesylate versus placebo
Figure 211. CGI score of 1 or 2 at 4 weeks
Figure 213. Discontinuation due to adverse events at 4–10 weeks
Atomoxetine versus placebo
Figure 227. Discontinuation due to adverse events at 8 to 12 weeks
Figure 228. Discontinuation due to adverse events at 24 weeks
Guanfacine versus placebo
Guanfacine versus dexmethamphetamine
Reboxetine versus placebo
Figure 239. Discontinuation due to adverse events at 6 weeks
Venlafaxine versus placebo
Figure 243. Discontinuation due to adverse events at 6 weeks
Bupropion versus placebo
Figure 247. CGI-I score of 1 or 2 at 7 weeks
Figure 248. Discontinuation due to adverse events at 7 weeks
Bupropion versus methylphenidate
Figure 250. CGI-I score of 1 or 2 at 7 weeks
Figure 251. Discontinuation due to adverse events at 7 weeks
Modafinil versus placebo
Figure 257. Behavioural outcomes at 9 weeks (BRIEF-A); 0–100, lower values are beneficial
Figure 258. Discontinuation due to adverse events at 7 weeks
Modafinil versus dexamfetamine
Atomoxetine and buspirone versus placebo
Figure 265. Discontinuation due to adverse events at 8 weeks
E.2. Pharmacological sequencing
Children
E.2.1. Methylphenidate versus placebo in children with ADHD not responding to atomoxetine
Figure 266. Discontinued treatment due to adverse events
Figure 267. Adverse events leading to hospitalisation/death/disability
E.2.2. Lisdexamfetamine dimesylate versus placebo in children with ADHD who had not responded to previous methylphenidate treatment
Figure 269. Adverse events leading to hospitalisation/death/disability
E.2.3. Lisdexamfetamine dimesylate versus atomoxetine in children with ADHD who had an inadequate response to previous methylphenidate treatment
Figure 270. ADHD total symptoms (investigator rated ADHD-RS-IV, change score, 0–54, high is poor)
Figure 271. Hyperactivity/impulsivity (Investigator rated, ADHD-RS-IV, high is poor)
Figure 272. Inattention (Investigator rated, ADHD-RS-IV, high is poor)
Figure 273. CGI-S improvement of at least one category
Figure 274. Discontinued treatment due to adverse event
Figure 276. Function/behaviour (Parent rated, WFIRS-P, 0–3, high is poor)
E.2.4. Guanfacine AM versus placebo in children with ADHD are taking CNS stimulants but have a partial or suboptimal response
Figure 277. CGI-I minimally improved or much improved or very much improved
Figure 278. Early discontinuation of treatment due to adverse events
Figure 279. Adverse events leading to hospitalisation/death/disability (severe TEAEs)
Figure 280. ADHD symptoms (ADHD-RS-IV inattention subscale)
Figure 281. ADHD symptoms (ADHD-RS-IV)
Figure 282. ADHD symptoms (ADHD-RS-IV hyperactivity/impulsivity subscale)
E.2.5. Guanfacine PM versus placebo in children with ADHD are taking CNS stimulants but have a partial or suboptimal response
Figure 283. CGI-I minimally improved or much improved or very much improved
Figure 284. Early discontinuation of treatment due to adverse events
Figure 285. Adverse events leading to hospitalisation/death/disability (severe TEAEs)
Figure 286. ADHD symptoms (ADHD-RS-IV inattention subscale)
Figure 287. ADHD symptoms (ADHD-RS-IV)
Figure 288. ADHD symptoms (ADHD-RS-IV hyperactivity/impulsivity subscale)
E.2.6. Clonidine versus placebo in children with ADHD and insufficient response to stimulant treatment
Figure 289. ADHD total symptoms (ADHD-RS-IV improvement, high is poor)
Figure 290. Inattention (ADHD-RS-IV, high is poor)
Figure 291. Hyperactivity/impulsivity (ADHD-RS-IV, high is poor)
E.2.7. Risperidone versus placebo in children with ADHD who do not show sufficient clinical response to methylphenidate
Figure 293. ADHD total symptoms (parent rated ADHD-SC4, Severity Score, 0–3, high is poor)
Figure 294. ADHD total symptoms (teacher rated ADHD-SC4, Severity Score, 0–3, high is poor)
Figure 295. Inattention (parent rated ADHD-SC4 Severity, 0–3, high is poor)
Figure 296. Inattention (teacher rated ADHD-SC4 Severity, 0–3, high is poor)
Figure 297. Hyperactivity (parent rated ADHD-SC4 Severity Subscore, 0–3, high is poor)
Figure 298. Hyperactivity (teacher rated ADHD-SC4 Severity Subscore, 0–3, high is poor)
Figure 299. Impulsivity (parent rated ADHD-SC4 Severity Subscore, 0–3, high is poor)
Figure 300. Impulsivity (teacher rated ADHD-SC4 Severity Subscore, 0–3, high is poor)
Figure 301. Function/behaviour (parent rated ODD DSM-IV, 0–3, high is poor)
Figure 302. Function/behaviour (teacher rated ODD DSM-IV, 0–3, high is poor)
Figure 303. Function/behaviour (teacher rated Peer Conflict Scale, 0–3, high is poor)
Figure 304. Function/behaviour (parent rated Peer Conflict Scale, 0–3, high is poor)
Figure 305. Function/behaviour (parent rated CD DSM-IV, 0–3, high is poor)
Figure 306. Function/behaviour (teacher rated CD DSM-IV, 0–3, high is poor)
Adults
E.2.8. Guanfacine versus placebo in adults with a sub-optimal response to CNS stimulants
Figure 307. ADHD total symptoms (ADHD-RS, 0–54, high is poor)
Figure 308. CGI-S (change score, 0–7, high scores are beneficial)
Figure 309. Adverse events leading to hospitalisation/death/disability
Appendix F. GRADE tables
F.1. Pharmacological efficacy
F.1.1. Pre-school children (under the age of 5)
Table 80. Clinical evidence profile: methylphenidate versus placebo
Table 81. Clinical evidence profile: Risperidone versus methylphenidate
Table 82. Clinical evidence profile: Methylphenidate and risperidone versus methylphenidate
F.1.2. Children and young people (aged 5 to 18)
Table 83. Clinical evidence profile: IR methylphenidate versus placebo
Table 84. Clinical evidence profile: OROS methylphenidate versus placebo
Table 85. Clinical evidence profile: IR methylphenidate versus OROS methylphenidate
Table 86. Clinical evidence profile: lisdexamfetamine versus placebo
Table 87. Clinical evidence profile: methylphenidate versus lisdexamfetamine
Table 88. Clinical evidence profile: atomoxetine versus placebo
Table 89. Clinical evidence profile: atomoxetine versus methylphenidate
Table 90. Clinical evidence profile: atomoxetine versus guanfacine
Table 91. Clinical evidence profile: guanfacine versus placebo
Table 92. Clinical evidence profile: extended release guanfacine versus placebo
Table 93. Clinical evidence profile: Clonidine versus placebo
Table 94. Clinical evidence profile: Clonidine versus methylphenidate
Table 95. Clinical evidence profile: Clonidine versus desipramine
Table 96. Clinical evidence profile: Clonidine versus carbamazepine
Table 97. Clinical evidence profile: Desipramine versus placebo
Table 98. Clinical evidence profile: Venlafaxine versus methylphenidate
Table 99. Clinical evidence profile: Risperidone versus placebo
Table 100. Clinical evidence profile: Ariprazole versus placebo
Table 101. Clinical evidence profile: Buspirone versus methylphenidate
Table 102. Clinical evidence profile: Buproprion versus placebo
Table 103. Clinical evidence profile: Buproprion versus methylphenidate
Table 104. Clinical evidence profile: Modafinil versus placebo
Table 105. Clinical evidence profile: modafinil versus methylphenidate
Table 106. Clinical evidence profile: melatonin versus placebo
Table 107. Clinical evidence profile: amantadine versus methylphenidate
Table 108. Clinical evidence profile: methylphenidate and clonidine versus methylphenidate
Table 109. Clinical evidence profile: methylphenidate and clonidine versus clonidine
Table 110. Clinical evidence profile: methylphenidate and clonidine versus placebo
Table 111. Clinical evidence: atomoxetine and fluoxetine versus placebo
F.1.3. Adults
Table 112. Clinical evidence profile: Immediate release methylphenidate versus placebo
Table 113. Clinical evidence profile: OROS methylphenidate versus placebo
Table 114. Clinical evidence profile: Dexamfetamine versus placebo
Table 115. Clinical evidence profile: Lisdexamfetamine dimesylate versus placebo
Table 116. Clinical evidence profile: Atomoxetine versus placebo
Table 117. Clinical evidence profile: Guanfacine versus placebo
Table 118. Clinical evidence profile: Guanfacine versus dexamfetamine
Table 119. Clinical evidence profile: Reboxetine versus placebo
Table 120. Clinical evidence profile: Venlafaxine versus placebo
Table 121. Clinical evidence profile: Bupropion versus placebo
Table 122. Clinical evidence profile: Bupropion versus methylphenidate
Table 123. Clinical evidence profile: Modafinil versus placebo
Table 124. Clinical evidence profile: Modafinil versus dexamfetamine
Table 125. Clinical evidence profile: Atomoxetine and buspirone versus placebo
F.2. Pharmacological sequencing
F.2.1. Pre-school children (under the age of 5)
No clinical evidence.
F.2.2. Children and young people (aged 5 to 18)
Table 131. Clinical evidence profile: Clonidine versus placebo for ADHD in children and young people
Appendix G. Health economic evidence selection
* Non-relevant population, intervention, comparison, design or setting; non-English language
Appendix H. Health economic evidence tables
H.1. Pharmacological efficacy
Download PDF (615K)
H.2. Pharmacological sequencing
Download PDF (516K)
Appendix I. excluded studies
I.1. Excluded clinical studies
I.2. Excluded health economic studies
I.2.1. Pharmacological efficacy
I.2.2. Pharmacological sequencing
None
Appendix J. Research recommendations
J.1. Medication choice in people with co-existing conditions
Research question: What is the clinical and cost effectiveness of ADHD medications in people with ADHD and tic disorders, a history of psychosis or mania, or emotional dysregulation?
Why this is important:
This guideline did not identify any evidence to justify different medication choices in the groups with ADHD and tic disorders, a history of psychosis or mania, or emotional dysregulation. These groups are often excluded from trials. There are reasons (for example, mechanism of action of medication options, previous reports of adverse events) to suspect that these groups may respond differently to different drugs but a lack of trials to confirm this. Primarily there are some concerns that stimulant medication may worsen the symptoms of any of these co-existing conditions and therefore non-stimulant medication should be preferred.
Criteria for selecting high-priority research recommendations
J.2. Medication choice in people with no previous medication for ADHD
Research question: What is the clinical and cost effectiveness of ADHD medications in people with ADHD with no previous medication for the condition?
Why this is important:
This guideline makes recommendations for the medication choices for people with ADHD, but most of the evidence to support these recommendations comes from studies in people who have previously received medication. Therefore, these studies often include a population not representative of the people with newly diagnosed ADHD. There may be differing levels of efficacy of the various treatment options in this population.
Criteria for selecting high-priority research recommendations
J.3. Prescribing beyond monotherapy
Research question: What is the clinical and cost effectiveness of various ADHD prescribing strategies when monotherapy has failed?
Why this is important:
This guideline makes recommendations for the medication choices for people with ADHD up to the point at which common monotherapies are exhausted. There is very little evidence to guide healthcare professionals beyond this point, particularly with regards to whether there is a benefit of prescribing stimulant and non-stimulant medication together.
Criteria for selecting high-priority research recommendations
Final
Intervention evidence review
These evidence reviews were developed by the National Guideline Centre
Disclaimer: The recommendations in this guideline represent the view of NICE, arrived at after careful consideration of the evidence available. When exercising their judgement, professionals are expected to take this guideline fully into account, alongside the individual needs, preferences and values of their patients or service users. The recommendations in this guideline are not mandatory and the guideline does not override the responsibility of healthcare professionals to make decisions appropriate to the circumstances of the individual patient, in consultation with the patient and/or their carer or guardian.
Local commissioners and/or providers have a responsibility to enable the guideline to be applied when individual health professionals and their patients or service users wish to use it. They should do so in the context of local and national priorities for funding and developing services, and in light of their duties to have due regard to the need to eliminate unlawful discrimination, to advance equality of opportunity and to reduce health inequalities. Nothing in this guideline should be interpreted in a way that would be inconsistent with compliance with those duties.
NICE guidelines cover health and care in England. Decisions on how they apply in other UK countries are made by ministers in the Welsh Government, Scottish Government, and Northern Ireland Executive. All NICE guidance is subject to regular review and may be updated or withdrawn.
- Appendix 1. Cost-effectiveness analysis: What is the cost effectiveness of parent training compared to no treatment for children with ADHD? (PDF)
- Appendix 2. Cost-effectiveness analysis: Combination treatment in children and adolescents (PDF)
- Appendix 3. Cost-effectiveness analysis: Network meta-analysis for ADHD treatments in combination and individually (PDF)
- NICE guideline: methods (PDF)
- Evidence reviews for pharmacological efficacy and sequencing pharmacological tre...Evidence reviews for pharmacological efficacy and sequencing pharmacological treatment
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