letrozole · Medicine question

Can Femara (letrozole) be used during breastfeeding?

iatroX medicinesPublished 8 November 2026

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Answer

Femara (letrozole) is contraindicated during breastfeeding because it is unknown whether letrozole or its metabolites enter human milk, and a risk to newborns or infants cannot be excluded.

Sources for this answer

Femara 2.5 mg TabletsNovartis Pharmaceuticals UK Ltd · emc · SmPC §4.6 Fertility, pregnancy and lactation · Version 35Document updated 2 September 2025

Sources checked 8 November 2026

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