Propecia is an oral medication containing 1mg of Finasteride per tablet, used to treat male pattern baldness (androgenetic alopecia). Finasteride is a Type II 5-alpha reductase inhibitor that works by reducing levels of dihydrotestosterone (DHT), a hormone that causes hair follicles to shrink. By lowering DHT levels, Propecia helps hair follicles return to their normal size, promoting hair regrowth and reducing hair loss. Clinical studies indicate that Propecia is effective in treating male pattern hair loss, with many users experiencing hair regrowth or maintenance of existing hair after consistent daily use for several months. The medication is most beneficial for men in the early stages of balding with active hair follicles and is not recommended for those who are already near or completely bald.