Finasteride 1mg (brand name Propecia) is the gold-standard oral DHT blocker for male androgenic alopecia. It works by inhibiting 5-alpha-reductase type II, reducing serum DHT by approximately 70%. Consistency is critical — missing doses can cause a hormone rebound that accelerates shedding.
DHT (dihydrotestosterone) binds to androgen receptors in genetically susceptible hair follicles, causing the follicle to miniaturize over time. Finasteride blocks the enzyme (5α-reductase type II) that converts testosterone to DHT, reducing scalp DHT levels by 60–70% and halting follicle miniaturization.
Decreased libido
UncommonErectile dysfunction
UncommonReduced ejaculate volume
UncommonBreast tenderness (gynecomastia)
UncommonDepression or mood changes
UncommonPost-Finasteride Syndrome (persistent sides after stopping)
RareTesticular pain
RarePregnant women must not handle crushed or broken tablets — finasteride causes birth defects.
Side effects are reversible on discontinuation for most users.
A catch-up shed can occur if doses are missed for 1+ weeks.
PSA (prostate-specific antigen) levels will be approximately halved — inform your doctor.
Monitor mood changes; stop and consult if persistent depression occurs.
Typical Dose
1mg once daily, taken with or without food
Onset Time
6–12 months to see reduced shedding; full density recovery at 18–24 months
Category
oral
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Start free trialMedical disclaimer: The information on this page is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider or dermatologist before starting, stopping, or modifying any medication or treatment protocol. Hair loss medication interactions and individual responses vary significantly.