By the Medsmingle Team · Updated 13 November 2026
This is a prescription medicine. Only take it if it has been prescribed for you, and follow your doctor’s and pharmacist’s instructions.
Finasteride (Propecia 1 mg) is a daily tablet for male pattern hair loss. Along with minoxidil, it’s one of the two treatments with the strongest evidence. See also hair loss treatment for men.
How it works
It blocks the enzyme that turns testosterone into DHT, the hormone that shrinks hair follicles in men with pattern hair loss.
What results to expect
- Most men stop losing more hair, and many see some regrowth, especially at the crown
- Give it at least 6 to 12 months before judging
- Benefits fade over about a year if you stop
Side effects
- Lower libido, erection problems or less ejaculate in a small percentage of men (about 1 to 2% more than placebo in trials). Sexual symptoms may resolve, but persistent symptoms after stopping have also been reported.
- Breast tenderness or enlargement (rare)
- Mood changes, including depression, have been reported. For hair-loss treatment, stop and contact your doctor promptly if depression or suicidal thoughts develop; seek emergency help for immediate danger.
A small number of men report side effects that continue after stopping (sometimes called post-finasteride syndrome); this is still being studied.
Important to know
- Women who are or may become pregnant must not handle crushed or broken tablets, as finasteride can harm a male baby
- It can lower PSA levels; tell your doctor before prostate screening so results are interpreted correctly.
- Don’t donate blood while taking it and for 1 month after
Frequently asked questions
Can women take finasteride for hair loss?
It isn’t approved for women and must not be used in pregnancy. Some doctors prescribe it for women after menopause.
Is it better with minoxidil?
Many dermatologists recommend using both, as they work in different ways.
More in our Hair Loss guide: all our articles and products on this topic in one place.
For questions about a prescription or symptoms, speak with your own doctor or pharmacist. For website enquiries, contact our team.
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Source and further reading
MedlinePlus patient medicine information. This overview does not list every warning or interaction.
