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Finasteride

Also known as: Propecia, Proscar

Strong EvidencePharmaceuticalAndrogenic Alopecia

FDA-approved 5-alpha reductase inhibitor that reduces DHT by ~70%.

Regrowth Potential65%
Long-Term Viability90%

Mechanism of Action

Finasteride inhibits type II 5-alpha reductase, the enzyme that converts testosterone to dihydrotestosterone (DHT). By reducing scalp DHT levels by approximately 70%, it slows miniaturization of hair follicles in androgenetic alopecia.

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