Finasteride
5-Alpha-Reductase Inhibitor- Drug Class
- 5-Alpha-Reductase Inhibitor
- Mechanism of Action (MOA)
- Inhibits 5-α-reductase → ↓ conversion of testosterone to dihydrotestosterone (DHT) → shrinks the prostate.
- Clinical Notes
- BPH (shrinks the gland over months) and androgenetic alopecia. Lowers PSA ~50% (double the measured value when screening). Teratogen — pregnant women shouldn't handle crushed tablets; sexual dysfunction.
- Source
- FDA label
Sources
Reviewed September 2026- FDA label — FDA / DailyMed
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Used for
Same family
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