Chemical Formula: C21H32N2O Description Stanozolol is a synthetic anabolic steroid with therapeutic uses in treating hereditary angioedema. Stanozolol is derived from testosterone, and has been abused by several high profile professional athletes. Mechanism of action Stanozolol binds to androgen receptors, such as membrane bound receptor proteins LAGS and stanozolol-binding protein (STBP). Side effects Winstrol (anabolic steroids) is a synthetic steroid, similar to testosterone, used in the treatment of hereditary angioedema, which causes episodes of swelling of the face, extremities, genitals, bowel wall, and throat. Winstrol may decrease the frequency and severity of these attacks. The drug brand name Winstrol is no longer available in the U.S. Generic versions may still be available. Common side effects of Winstrol include: