Buy Danazol medication, Danazol is used to treat endometriosis (development of uterine-lining tissue outside the uterus, symptoms of which include abdominal pain, heavy periods, and infertility) and non-cancerous (benign) fibrocystic breast disease in adult patients not responding to other treatments. It is also used to prevent attacks of angioedema (swelling of eyes and lips) in patients with hereditary angioedema disorder.