Finasteride works by inhibiting the enzyme 5α-reductase, specifically the type II isoenzyme. This enzyme converts testosterone to dihydrotestosterone (DHT), a hormone strongly implicated in male pattern hair loss (androgenetic alopecia).
How it helps hair growth
By blocking DHT production, finasteride reduces the miniaturization of hair follicles, allowing them to produce thicker, longer hairs. This results in improved hair growth and potentially prevents further hair loss.
- Studies show finasteride is significantly more effective than placebo in increasing hair count and improving hair density. Its effects are most pronounced in the crown area. Benefits are typically seen after 3-6 months of consistent use, with optimal results often appearing after a year.
Important Considerations
Finasteride’s efficacy varies between individuals. While many experience noticeable improvement, some see minimal or no changes.
Potential Side Effects
- Reduced libido Erectile dysfunction Ejaculation disorders
These side effects are generally mild and temporary, but discontinuation may be warranted if they prove problematic. Discuss potential side effects and your personal medical history with your doctor before starting finasteride.
Regular blood tests are recommended for those using finasteride long-term to monitor prostate-specific antigen (PSA) levels. Finasteride is not approved for women or children.
