What are the side effects of Finasteride?

Potential side effects include: Decreased libido (2-4% of users), Erectile dysfunction (1-3% of users), Decreased ejaculate volume, Breast tenderness or gynecomastia (rare), Depression or mood changes (rare, debated).

How effective is finasteride for hair loss?

Finasteride is one of the most studied agents for androgenetic alopecia. It works by inhibiting type II 5-alpha-reductase, reducing DHT levels by approximately 70%. Large clinical trials have shown that 1 mg daily may increase hair count by 10-15% over 1-2 years. It is FDA-approved for male pattern hair loss and requires a prescription.

What are the side effects of finasteride?

Reported side effects in clinical trials include decreased libido, erectile dysfunction, and reduced ejaculate volume in a small percentage of users (1-2%). Most side effects resolve after discontinuation. A controversial topic is post-finasteride syndrome, though its prevalence and causation remain subjects of ongoing research. Consult a healthcare provider to weigh the benefits and risks.

How long does finasteride take to work for hair loss?

Clinical trials on finasteride for androgenetic alopecia typically assess outcomes at 12 to 24 months. Research across 129 studies with 18,623 participants shows measurable increases in hair count at 12 months in most men who respond to treatment. Hair loss stabilization may be visible earlier, at 3 to 6 months. Maximum benefits typically occur after 2 years of continuous use.

What dosage of finasteride is used for hair loss?

The standard dose for androgenetic alopecia is 1 mg daily, which selectively inhibits type II 5-alpha-reductase to reduce scalp DHT by approximately 60-70%. This differs from the 5 mg dose used for benign prostatic hyperplasia. Research across 129 studies with 18,623 participants established the efficacy and safety profile at 1 mg/day. Finasteride requires a prescription and medical supervision.

Can women use finasteride for hair loss?

Finasteride is contraindicated in women who are pregnant or may become pregnant due to risk of feminization in male fetuses. It is not FDA-approved for female pattern hair loss. Some studies have evaluated finasteride in postmenopausal women with mixed results. The Grade A (Strong) evidence base of 129 studies with 18,623 participants is predominantly in men. Women considering finasteride should consult a dermatologist to weigh individual benefits and risks.

Finasteride

pharmaceutical

Also known as: Propecia, Proscar

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About

Finasteride is a prescription 5-alpha-reductase inhibitor that reduces DHT levels by approximately 70%. It is FDA-approved for male pattern hair loss and supported by robust clinical trial data showing significant hair count increases over 1-2 years of use.

How It Works

Type II 5-alpha-reductase inhibitor reducing serum and scalp DHT by approximately 70%.

Evidence For Conditions

Condition	Grade	Studies	Participants
Androgenetic Alopecia	A	206	24777	View →

Side Effects

Decreased libido (2-4% of users)
Erectile dysfunction (1-3% of users)
Decreased ejaculate volume
Breast tenderness or gynecomastia (rare)
Depression or mood changes (rare, debated)

Drug & Supplement Interactions

No significant drug-drug interactions identified
May affect PSA test results (reduces PSA by ~50%)
Contraindicated in pregnancy (Category X teratogen)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Dutasteride Minoxidil Spironolactone

Quick Facts

Dosage: Hair_Loss: 1 mg/day oral
Forms: tablet
Upper Limit: 5 mg/day (BPH dose)
Best Time: Once daily at the same time, with or without food

Evidence Summary

Androgenetic Alopecia A

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.