Please describe the medication: proscar (finasteride)?

Prostate Medication: Treats an enlarged prostate (benign prostatic hyperplasia or bph) in men and causes hair growth in male pattern baldness. It may be used alone or in combination with other medicines such as an alpha-blocker (doxazosin, cardura®) to treat bph. This medicine is a 5-alpha-reductase inhibitor.

Proscar (finasteride): The generic name of this medication is finesteride. It is a 5-alpha reductase inhibitor which blocks the conversion of testosterone to dht. Dht is a driver of increased prostate growth. Use of this medication at 5mg per day can result in a reduction in prostate volume of up to 30% and a decrease in the growth rate of the prostate.