learn Finasteride
Popular 5-alpha reductase inhibitor that lowers DHT, taken as a pill or used topically
- Topical or oral? Choosing between pills and lotions according to your case. In studies, topical finasteride gave much lower blood levels of the drug than tablets but still lowered blood DHT, and whether it causes fewer side effects has not been established. There is no FDA-approved topical finasteride, and the FDA warned about compounded versions in April 2025.
- 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.
- Is Finasteride unbeatable or are there equally powerful alternatives? Finasteride has the longest record of trial evidence in male androgenetic alopecia; in pooled 24-week trials dutasteride increased hair counts more, and minoxidil, topical finasteride, PRP, LLLT and microneedling have supporting studies. Regulators warn that finasteride can cause sexual side effects, depression and suicidal thoughts that may persist after stopping, its label also lists breast, semen and other physical effects, and dutasteride now carries a precautionary mood warning; both are prescription-only, and dutasteride and oral minoxidil are off-label for hair loss.
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