learn Finasteride
Popular 5-alpha reductase inhibitor that lowers DHT, taken as a pill or used topically
- Is finasteride safe? In one-year trials most men tolerated finasteride 1 mg, but its risks are not only sexual: US, UK and EU regulators warn of sexual dysfunction, depression and suicidal thoughts, and of sexual and mood symptoms that have continued after stopping, and men also report cognitive, anxiety and physical symptoms. How often lasting problems happen, and how much of that the drug causes, is not known; finasteride is prescription-only and must not be taken, or handled as crushed or broken tablets, by women who are or may be pregnant.
- Are there really risks with topical finasteride? Reports on topical finasteride describe scalp irritation and dermatitis as the effects specific to it, and blood levels lower than the oral drug; whether the oral drug's systemic side effects (sexual, mood, suicidal-thought, cognitive and breast/semen effects, some reported to persist after stopping) are genuinely rarer on the topical form has not been measured in a trial powered to answer it. Both forms are prescription-only and contraindicated around pregnancy.
- Does stopping finasteride mean losing all progress? Here's what really happens. Studies and the drug label report that finasteride's benefit lasts only while it is taken: after stopping, scalp DHT returns to baseline and hair loss resumes over roughly 6 to 12 months. Plan any stop with the prescriber, but the UK regulator (MHRA, May 2026) advises stopping finasteride 1 mg immediately and contacting a doctor if depression or suicidal thoughts develop.


