How does Finasteride (Propecia) work?
Finasteride (Propecia) · finasteride · by Multiple (Merck originated as Propecia)
Reviewed by the glpzoom Editorial Team against primary clinical sources — FDA labeling, peer-reviewed trials, and specialty-society guidelines.
Content current as of June 2026; updated when guidance or availability changes.
Blocks the enzyme that converts testosterone into DHT (dihydrotestosterone). DHT is the androgen that miniaturizes hair follicles in genetically susceptible men. Lower DHT → less follicle miniaturization → less shedding, partial regrowth.
Where to get Finasteride (Propecia)
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More on Finasteride (Propecia)
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- ← Full Finasteride (Propecia) overview
People also ask
Frequently asked
How does Finasteride (Propecia) work in the body?+
Blocks the enzyme that converts testosterone into DHT (dihydrotestosterone). DHT is the androgen that miniaturizes hair follicles in genetically susceptible men. Lower DHT → less follicle miniaturization → less shedding, partial regrowth.
How long until Finasteride (Propecia) starts working?+
Most patients notice appetite changes within 1-2 weeks. Meaningful weight or clinical change typically follows the full titration period (3-5 months).