Finasteride is a prescription-only treatment for male pattern baldness that prevents further hair loss in 90% of cases and helps to promote regrowth. Many patients notice visible results in six to 13 months, however, some see results within the first four-to-six months. Finasteride is suitable for all men aged 18 or over. While men experiencing the first signs of male pattern hair loss are likely to see the best results, Finasteride is suitable for any stage of hair loss. By preventing the hormones responsible for hair loss from shrinking the hair follicles, Finasteride helps to limit, prevent and in some cases reverse bale pattern hair loss (male androgenetic alopecia).