Proviron (Mesterolone) mesterolone is an orally applicable androgen and dihydrotestosterone derivative. It is sold under the brand name Proviron, by Bayer Schering Pharma.

Helps a man have an erection or have a better erection with his penis during sex. Also treats pulmonary arterial hypertension (high blood pressure in the lungs) in both men and women.