Treatment Deep-Dive

Finasteride for hair loss

Finasteride is the prescription tablet aimed squarely at the hormone behind male-pattern loss. Here's how effective it is and the truth about side effects.

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How it works

Male-pattern loss is driven by DHT shrinking follicles. Finasteride knocks out a large share of the type 2 5-alpha-reductase enzyme that makes DHT, taking the pressure off so follicles can rebound.

How effective

Studies put finasteride at halting further loss in roughly 80–90% of men, with visible regrowth in about two-thirds. Start earlier for better odds, and it hits its stride with minoxidil — about 94% of men improved on the pair over a year.

Tablet or topical

The 1 mg oral tablet is the standard, most-studied form. A topical version targets the scalp with less DHT in the bloodstream, which may lower systemic side effects while keeping most of the benefit.

Side effects, honestly

A minority of men experience sexual side effects, usually reversible once they stop. Being hormone-active, it's prescription-only and not for women who might become pregnant. For stronger DHT control, dutasteride is the step up to discuss with a doctor.

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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.