The Basics
What is Letrozole?
A non-steroidal aromatase inhibitor used to treat breast cancer in postmenopausal women.
Brand names for Letrozole
Femara
How Letrozole is classified
Antineoplastic Agents, Aromatase Inhibitors
Letrozole During Pregnancy
Letrozole pregnancy category
Category N/ANote that the FDA has deprecated the use of pregnancy categories, so for some medications, this information isn’t available. We still think it’s useful to list historical info, however, given what a common proxy this has been in the past.
What we know about taking Letrozole while pregnant
spontaneous abortions, congenital birth defects
Taking Letrozole While Breastfeeding
What are recommendations for lactation if you're taking Letrozole?
No information is available on the use of letrozole during breastfeeding. The manufacturer recommends that breastfeeding be discontinued during letrozole therapy and for 3 weeks after the last dose.
Maternal / infant drug levels
No information is available on the use of letrozole during breastfeeding. The manufacturer recommends that breastfeeding be discontinued during letrozole therapy and for 3 weeks after the last dose.
Possible effects of Letrozole on milk supply
Relevant published information was not found as of the revision date.
Possible alternatives to Letrozole
None listed
List of References
Lactation sources: Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK501922/None listed
Disclaimer: This material is provided for educational purposes only and is not intended for medical advice, diagnosis, or treatment. Consult your healthcare provider with any questions.
