Stanozolol is an artificial steroid that functions similarly to the naturally occurring steroid testosterone. Stanozolol is used to treat hereditary angioedema, a condition that causes swelling of the face, limbs, genitals, intestinal wall, and throat. Stanozolol is used in the treatment of hereditary angioedema, which causes episodes of swelling of the face, extremities, genitals, bowel wall, and throat. Stanozolol may decrease the frequency and severity of these attacks. Stanozolol reduces bradykinin production and could potentially reduce the impact of a bradykinin storm. Stanozolol has been shown to reduce the frequency and severity of these outbreaks. Common stanozolol side effects may include acne, difficulty sleeping, and headache.