Understanding finasteride

A starting point for your conversation

This guide covers finasteride in the context of male pattern hair loss. Establishing the cause of hair loss and discussing possible benefits and harms comes before a treatment decision.

This is information about preparing for care. It does not establish whether a medicine is suitable for you or replace advice from your clinician.

What to discuss

Include anything that has changed since a previous assessment. It is fine to say when you do not know an answer.

• The pattern and duration of hair loss and any scalp symptoms
• Previous treatments, medical history and other medicines
• Mood, sexual health, fertility concerns and questions about side effects

Your GP or usual prescriber’s details and your preferences about sharing care information form part of the assessment.

What to have ready

What a review can lead to

A clinician may need further information, an examination, records or test results. The outcome may be advice, non-medicine options, a different treatment, a prescription where appropriate, or referral for other care.

Ask about expected benefits, possible side effects, interactions, alternatives and when treatment should be reviewed. An assessment or a previous prescription does not guarantee further prescribing.

Further reading

These primary sources provide additional information. Product information may relate to a specific brand or formulation; always check the leaflet supplied with your own medicine.

• Propecia 1 mg: UK SmPC
• MHRA: finasteride and dutasteride safety update, May 2026
• British Association of Dermatologists: male pattern hair loss
• NHS: hair loss