Proscar (Finasteride) is an androgen hormone inhibitor used in men to treat benign prostatic hyperplasia (BPH) which is swelling of the prostate. This medicine works by lowering the amount of a hormone in your body called dihydrotestosterone or DHT. Reducing this hormone level in your body may help to reduce the swelling of the prostate and reduce the symptoms of BPH.Prscar and Propecia are the same drug. To save the money you can buy proscar and take 1/4 pill.