FDA Section 4 \u2022 who must NOT take this
Letrozole - Contraindications
These conditions, allergies, and situations mean Letrozole should NOT be used. From the US FDA-approved drug label Section 4.
4 CONTRAINDICATIONS Pregnancy: Letrozole can cause fetal harm [see Use in Specific Populations ].
Known hypersensitivity to the active substance, or to any of the excipients [see Adverse Reactions ].
Pregnancy Known hypersensitivity to the active substance, or to any of the excipients