Most abused preparation is Proviron. Proviron is a synthetic, orally effective androgen which shows no anabolic properties. In school medicine Proviron deployed to reduce or eliminate failures caused by deficiency of male sex hormones. This formulation, as already stated, only eliminates or reduces disturbances associated with testosterone deficiency. This is especially the potency disorders, usually conditional androgen deficiency that can occur after discontinuation of steroids, and infertility which is the result of the lower their sperm count and reduced quality. Proviron among estrogen antagonist which prevents the aromatization of steroids. The side effects of Proviron in men can be described as minimal. Since Proviron workability in the liver is very good, with anticipated failure of the function. Manufacturer Jenapharm writes in stoking a leaflet about its preparation Vistimon following: "In high doses can cause random retention (retention) of electrolytes and water and subsequent edema formation." Much more common side effect of Proviron is excessive sexual stimulation and in some cases long-term erection of the penis. Since such a condition can be painful and can lead to potential damage, is a reduction of the dose, respectively. discontinuation of the preparation only reasonable solution. Female athletes should use Proviron with caution since it can not rule out the potential androgenic side effects.