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Finasteride is a prescription medicine. The 1 mg strength is used for male pattern hair loss, and 5 mg for an enlarged prostate. Do not switch strengths yourself. It is generally not recommended for women; specialist advice is essential.
What is the mood warning?
Finasteride has been linked to depression, suicidal thoughts and sexual problems that can persist after stopping. If depression or suicidal thoughts develop while taking 1 mg, stop it and contact your doctor as soon as possible. If taking 5 mg, contact your doctor as soon as possible. If you have seriously harmed yourself or may do so, call your local emergency services immediately.
What are the other side effects?
Erectile difficulties, reduced sex drive, ejaculation problems, breast swelling or tenderness, and testicular pain can occur.
What about pregnancy?
Women who are pregnant or trying to conceive should not handle crushed or broken tablets. If your partner is pregnant or may be, ask your doctor about using a condom, as semen may contain a small amount of the medicine.
When should I get help?
Report breast lumps, pain, enlargement or nipple discharge promptly. Call your local emergency number (000 in Australia) for sudden swelling of the lips, mouth, throat or tongue, trouble breathing, or fainting.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency, or the Poisons Information Centre on 13 11 26 for a possible overdose. Outside Australia, use your local emergency and poison-information services.
Source: MHRA: Updated finasteride safety warnings and UK patient leaflet: Finasteride 5 mg and NHS: About finasteride. General education does not replace individual medical advice. Updated November 2026.
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