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Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-.
CASRN: 1018448-65-1
Drug Levels and Effects
Summary of Use during Lactation
No information is available on the clinical use of trastuzumab emtansine during breastfeeding. Because trastuzumab is a large protein molecule with a molecular weight of 145,531 Da, the amount in milk is likely to be very low. It is also likely to be partially destroyed in the infant's gastrointestinal tract and absorption by the infant is probably minimal. However, emtansine (DM1) is a small-molecule microtubule inhibitory drug, which might be excreted into milk. The manufacturer recommends that breastfeeding be discontinued during trastuzumab deruxtecan therapy and for 7 months after the last dose.
Drug Levels
Maternal Levels. Relevant published information was not found as of the revision date.
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
Relevant published information was not found as of the revision date.
Effects on Lactation and Breastmilk
Relevant published information was not found as of the revision date.
Substance Identification
Substance Name
Trastuzumab Emtansine
CAS Registry Number
1018448-65-1
Drug Class
Breast Feeding
Milk, Human
Antibodies, Monoclonal
Antineoplastic Agents
Immunoconjugates
Tubulin Modulators
Disclaimer: Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.
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- Review Ado-Trastuzumab Emtansine.[Drugs and Lactation Database (...]Review Ado-Trastuzumab Emtansine.. Drugs and Lactation Database (LactMed®). 2006
- Review Trastuzumab Deruxtecan.[Drugs and Lactation Database (...]Review Trastuzumab Deruxtecan.. Drugs and Lactation Database (LactMed®). 2006
- Review Trastuzumab.[Drugs and Lactation Database (...]Review Trastuzumab.. Drugs and Lactation Database (LactMed®). 2006
- Review Ado-trastuzumab emtansine: a HER2-positive targeted antibody-drug conjugate.[Ann Pharmacother. 2014]Review Ado-trastuzumab emtansine: a HER2-positive targeted antibody-drug conjugate.Corrigan PA, Cicci TA, Auten JJ, Lowe DK. Ann Pharmacother. 2014 Nov; 48(11):1484-93. Epub 2014 Jul 31.
- Review Profiling and targeting HER2-positive breast cancer using trastuzumab emtansine.[Pharmgenomics Pers Med. 2014]Review Profiling and targeting HER2-positive breast cancer using trastuzumab emtansine.Sadeghi S, Olevsky O, Hurvitz SA. Pharmgenomics Pers Med. 2014; 7:329-38. Epub 2014 Oct 15.
- Trastuzumab Emtansine - Drugs and Lactation Database (LactMed®)Trastuzumab Emtansine - Drugs and Lactation Database (LactMed®)
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