Proviron contains mesterolone, a synthetic derivative of dihydrotestosterone. It is orally active and interacts with androgen receptors, producing predominantly androgenic activity.

Mesterolone has been used in some countries for selected conditions associated with androgen deficiency and male reproductive disorders. Unlike testosterone, it does not undergo aromatization into estrogen.

Androgenic therapy can affect endogenous hormone production, fertility, lipid metabolism, and prostate-related parameters. The precise strength of the supplied tablets should be confirmed from the product packaging.