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
Lactation
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.
Publication Details
Publication History
Last Revision: March 15, 2023.
Copyright
Attribution Statement: LactMed is a registered trademark of the U.S. Department of Health and Human Services.
Publisher
National Institute of Child Health and Human Development, Bethesda (MD)
NLM Citation
Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-. Trastuzumab Emtansine. [Updated 2023 Mar 15].