Treatment Deep-Dive

Finasteride for hair loss

Finasteride is a prescription DHT blocker that stops hair loss in most men. Here's how it works, results, and the side-effect picture.

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How finasteride works

Finasteride blocks the type 2 5-alpha-reductase enzyme, lowering DHT — the hormone that shrinks follicles in male-pattern baldness. Less DHT means follicles are protected and can recover.

Results

Finasteride stops hair loss in about 80–90% of men and produces visible regrowth in roughly 65%. It works best started early and is most powerful combined with minoxidil — around 94% of men improved on the combo at one year.

Oral vs topical

Oral (1 mg daily) is the standard, best-studied form. Topical finasteride delivers it to the scalp with lower blood-DHT levels, which may mean fewer systemic side effects while keeping much of the benefit.

Side effects

A minority of men report sexual side effects; most are reversible on stopping. Because it affects hormones, it's prescription-only and not for women who are or may become pregnant. Talk to a doctor about whether it's right for you — or consider dutasteride, a stronger DHT blocker.

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Medical disclaimer: This page is general educational information, not medical advice, diagnosis, or treatment. Success rates are estimates from published sources and vary by individual. Always consult a licensed physician or dermatologist before starting or stopping any treatment.

Frequently asked questions

Does finasteride work for hair loss?

For most men, yes. Finasteride blocks the hormone DHT that shrinks follicles, and studies show it stops loss in the large majority of users and regrows some hair, especially at the crown. It works best started early.

What are the side effects of finasteride?

Most men have none. A small percentage report sexual side effects (reduced libido or function), which usually resolve after stopping. Discuss your history with a doctor before starting.

How long until finasteride works?

Give it time. You may see reduced shedding in 3-4 months, but visible regrowth typically takes 9-12 months. Results are maintained only while you keep taking it.