Propecia: Treating Male Pattern Baldness with Finasteride Propecia is a prescription medication primarily used to treat male pattern baldness or androgenetic alopecia. It is a popular choice among men who are experiencing hair loss and seeking a solution to help restore their hair. The active ingredient in Propecia is finasteride, which works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT). DHT is a hormone that is known to shrink hair follicles in the scalp, leading to hair loss. By blocking the conversion of testosterone to DHT, Propecia helps to reverse the effects of male pattern baldness. This medication is …