Finasteride

In medicine, finasteride (Proscar®) is "an orally active testosterone 5-alpha-reductase inhibitor. It is used as a surgical alternative for treatment of benign prostatic hyperplasia."

Finasteride has also been found to reduce the incidence of prostate cancer in the randomized controlled trial; however, the trial reported statistical significance in the increase in the risk of high grade prostate cancer. Subsequent analysis of the data suggests the incidence of high grade cancer is increased but without statistical significance.