Propecia is a drug for benign prostatic hyperplasia and male pattern baldness. It is a type 2 5-reductase inhibitor 5-reductase. It turns androgen testosterone into 5-dihydrotestosterone or DHT. Propecia blocks the male hormone that causes prostate enlargement. It treats male pattern baldness by obstructing the body's production of the male hormone, responsible for hair growth stoppage. Propecia belongs to the drug class 5-alpha-reductase inhibitors and is used to prevent the conversion of testosterone to dihydrotestosterone in the body. This medication treats male pattern hair loss in the anterior mid-scalp area and the vertex. Male pattern hair loss is a condition whereby they experience thinning of hair on the scalp. This results to balding or receding hairline on the top of the head. Use Propecia in men only and not to be used by children or women. Propecia works by decreasing the amount of natural body hormone (DHT). When this hormone is decreased in the body, there will be slower hair loss and an increase in hair growth.