Pregnancy: PROSCAR is contraindicated for use in women when they are or may potentially be pregnant (see CONTRAINDICATIONS).
Because of the ability of Type II 5α-reductase inhibitors to inhibit conversion of testosterone to dihydrotestosterone, these drugs, including finasteride, may cause abnormalities of the external genitalia of a male fetus when administered to a pregnant woman.
Exposure to Finasteride - Risk to Male Fetus: Women should not handle crushed or broken tablets of PROSCAR when they are or may potentially be pregnant because of the possibility of absorption of finasteride and the subsequent potential risk to a male fetus (see USE IN PREGNANCY). PROSCAR tablets are coated and will prevent contact with the active ingredient during normal handling, provided that the tablets have not been broken or crushed.
Nursing Mothers: PROSCAR is not indicated for use in women.
It is not known whether finasteride is excreted in human milk.