Finasteride?is used to shrink an?enlarged prostate?(benign prostatic hyperplasia?or?BPH) in adult men. It may be used alone or taken in combination with other?medications?to reduce symptoms of?BPH?and may also reduce the need for surgery.Finasteride may improve symptoms of?BPH?and provide benefits such as decreased urge to urinate, better urine flow with less straining, less of a feeling that the?bladder?is not completely emptied, and decreased nighttime urination. This?medication?works by decreasing the amount of a natural body?hormone?(DHT) that causes growth of the?prostate