Danazol

A drug used for treating endometriosis, noncancerous breast disease, and menorrhagia. Danazol suppresses the release of gonadotrophin hormones, which in turn reduces the production of the hormone oestrogen. This action usually prevents ovulation and causes irregularity or absence of menstrual periods. Possible side effects include nausea, rash, and weight gain. Pregnancy should be avoided while taking danazol.