Finasteride (brand name Propecia) is the gold standard for treating Male pattern baldness. Finasteride is very effective in fighting hair loss and takes about three to four months to show its effect and within the year you will be able to see full results.
Finasteride works by inhibiting the production of 5α-Reductase ( commonly known as dihydrotestosterone or DHT). DHT hormone is responsible for causing the hair follicles to shrink and eventually stop growing hair. The key to getting maximum benefit from Finasteride is to take it regularly as per the prescription. Normally 1mg of Finasteride is taken per day and you can take the medications as long as you like it. It is one of the few FDA approved and clinically tested treatment methods for androgenetic alopecia in males.