Buy Danogen 50mg (Danazol), 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)