Does finasteride (Propecia) work for hair loss? Results and risks

Does finasteride help male-pattern hair loss?

Finasteride reduces formation of dihydrotestosterone (DHT), a hormone involved in male-pattern hair loss. Propecia is a 1 mg finasteride tablet for that use. Higher-strength finasteride products for prostate enlargement have a different indication; do not swap or divide another prescription on your own.

The UK Propecia leaflet describes the specific product and its eligible population. It should not be presented as an authorisation for every adult with any type of hair loss.

What results can you realistically assess?

The NHS finasteride guidance explains that improvement in hair loss may take three to six months. Response varies, and treatment does not guarantee regrowth.

A claim that a fixed percentage of users regrow hair needs the exact trial, population, measurement and duration. This guide does not retain unsupported percentages or describe treatment as an “insurance policy”.

At review, discuss whether the diagnosis is correct, what change is being measured and whether benefits justify continuing. Photos taken under consistent conditions can help the conversation; they do not replace clinical assessment.

Pregnancy: broken tablets versus intact coating

The Propecia leaflet advises that women who are pregnant or planning pregnancy must not touch crushed or broken tablets, because contact with the active medicine may pose a risk to a male fetus.

Intact tablets have a coating intended to prevent contact with the medicine during normal handling. That is a formulation-specific distinction, not a general declaration that all handling is safe. If there has been exposure or the coating is damaged, ask a clinician or pharmacist for advice.

Sexual effects and current mood warnings

Sexual adverse effects can occur, and persistent symptoms after stopping have been reported. Discuss changes in libido, erections or ejaculation with the prescriber.

The EMA's 2025 review confirmed suicidal thoughts as a side effect of finasteride tablets; frequency could not be estimated. For 1 mg tablets used for hair loss, EMA advises stopping treatment and contacting a doctor promptly if mood changes develop.

Thoughts of self-harm need immediate help. Do not minimise this warning as occasional low mood or assume that normal sexual function excludes a mood-related adverse effect.

Before choosing a treatment

Discuss other possible causes of hair loss, previous treatment, health conditions and expectations. A clinician can explain alternatives and how they differ without promising a particular result.

See how independent online assessment works. Prescrivia is a technology intermediary. Independent clinicians decide suitability; it does not prescribe or guarantee medicine access or regrowth.

General information only, not medical advice. Follow the leaflet for your actual product and discuss decisions with a qualified clinician. See the current clinical, legal and language review statuses for this edition.

Sources

• Organon UK Propecia patient leaflet: male-pattern hair-loss product, intact versus broken-tablet handling and product-specific precautions.
• NHS finasteride guidance: DHT mechanism, months-to-benefit timeframe and reports of persistent sexual effects.
• EMA 2025 review: suicidal ideation is a finasteride-tablet side effect; stop 1 mg hair-loss treatment and seek advice for mood changes.

Sources checked online on 6 October 2026. Country-specific guidance does not establish availability or prescribing rules throughout Europe.