Dutasteride is the strongest DHT-blocker in standard pharmacy circulation — typically chosen after finasteride non-response, or by men with more advanced pattern hair loss who want the most potent oral option. Prescribed off-label for hair loss at Bidwell.
Both drugs block 5-alpha reductase, the enzyme that converts testosterone into DHT. Finasteride blocks only type II. Dutasteride blocks type I and II, which produces deeper DHT suppression in the scalp — roughly 90% versus about 70% — and it stays in the body far longer. In head-to-head trials for androgenetic alopecia, dutasteride consistently outperforms finasteride for hair count and thickness, with a broadly similar side-effect profile. The trade-off: if a side effect does appear, it can take weeks to clear after stopping.
In the United States, dutasteride is FDA-approved only for BPH (benign prostatic hyperplasia). Prescribing it for hair loss is "off-label" — legal, evidence-based, and routine in dermatology practice, but technically not an FDA-reviewed use. South Korea and Japan have approved dutasteride for hair loss; the US has not.
0.5 mg once daily, oral, with or without food. Consistency matters less day-to-day than with finasteride because of the 5-week half-life — but steady daily dosing is still what's studied. Some men take it on alternating days under a dermatologist's guidance; we prescribe the standard daily dose.
Sexual side effects (libido, erectile, ejaculatory) are reported in roughly 1–4% of men. Gynecomastia and mood changes are rare. Because of the long half-life, we counsel more carefully about stopping — any side effect can take weeks to resolve. Dutasteride also lowers PSA by about 50%, so men over 50 should have a PSA discussion with their PCP before starting.
cash-pay visit fee — same price whether you choose dutasteride alone or as part of a combination plan. Generic dutasteride cost varies by pharmacy, insurance, and discount-card pricing. Medication cost is separate.
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