finasteride
Quick Summary
Finasteride is a drug that acts as an antiandrogen, meaning it blocks the effects of male hormones like testosterone. It works by inhibiting the enzyme 5-alpha-reductase, which converts testosterone into dihydrotestosterone (DHT). DHT is a more potent form of testosterone that contributes to male pattern baldness and benign prostatic hypertrophy.12
Finasteride is prescribed to treat these conditions. When used for benign prostatic hypertrophy, it can increase urine flow and decrease prostate volume. For male pattern baldness, it is approved for topical treatment and can help prevent further hair loss and promote new hair growth in some individuals. Impotence is a rare side effect.12
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