The United States Food and Drug Administration approved Propecia as the first and only pill demonstrated to treat male pattern hair loss on the vertex the top of head and anterior mid-scalp area the middle front of head this for men only. Insufficient evidence exists that Propecia works for receding hairlines at the temples and more research is being currently conducted on this issue.

Merck, the company that developed and produces Propecia based their evidence on a photographic assessment by an expert panel of dermatologists, which followed a five year clinical study.  Propecia works in controlling hair loss and helping with hair re-growth and most men see results three to twelve months after starting Propecia.

The effectiveness was proved in studies of men aged 18 to 41, with mild to moderate hair loss at the top and middle front of the head.  Exclusively, Propecia is for the treatment of male pattern hair loss in men and should not be used by women or children.

By significantly reducing the amount of DHT which is a chemical that affects hair loss in men. Propecia inhibits the formation of DHT in your scalp and lowering DHT appears to inhibit the further shrinking of affected hair follicles. If studies are correct and hair loss is the result of a chemical imbalance DHT is a substance scientists believe that this and family history are the main reasons for hair loss. Propecia helps re-grow visible hair and reduces further hair loss by regeneration of lost hair follicles, which has long been the subject of many studies.

Propecia begins to work from day one according to men taking it and it has been demonstrated in studies to be effective in most men. Two out of three men on Propecia experienced re-growth of hair as measured by actual hair counts and studies have shown that taking the once-a-day pill works to lower the amount of DHT in your scalp.

After you start taking Propecia you may see a decrease in hair loss beginning in as little as 3 months, and by 6 to 12 months, you are likely to see new hair growth. Should Propecia not work for you after 12 months, it is unlikely to be of benefit and you may want to try a different hair loss treatment. Stopping taking Propecia, may result in loss of any hair you’ve gained within 12 months of stopping treatment. Propecia has been used by more than 1 million men in the United States since the drug’s introduction in 1998.

A small number of men experienced certain sexual side effects, such as less desire for sex, difficulty in achieving an erection, or a decrease in the amount of semen. These side effects occurred in less than 2 percent of men and went away in men who stopped taking Propecia.