[F]inasteride is associated with common adverse health effects in women…such as irregular menstrual cycle, aromatase disorder, high cholesterol, heavy menstrual bleeding and induced DNA damage.

[F]inasteride is associated with common adverse health effects in women with long-term treatment for androgenetic alopecia, such as irregular menstrual cycle, aromatase disorder, high cholesterol, heavy menstrual bleeding and induced DNA damage. Long-term-treatment follow-up revealed that (5 mg/day) effects on hair growth are sustained in most women. Finally, the study recommended that finasteride should not be administrated as treatment for androgenetic alopecia in women.

—Prolonged use of finasteride-induced gonadal sex steroids alterations, DNA damage and menstrual bleeding in women: Bioscience Reports, February 2020