Methyltestosterone treatment of infertility associated with pelvic endometriosis.

Sixty-four patients who had infertility associated only with endometriosis were treated with methyltestosterone, 5 mg/day, continuously for a period of 6 months. The patients continued to ovulate while receiving medication and 12 patients became pregnant, on an average, 6 months after the initiation of therapy. A computer analysis indicated that approximately 30% of the patients could expect pregnancy within 2 years after the testosterone treatment was begun. The side effects of the low-dose methyltestosterone therapy were acne in 6% of the patients, mild hirsutism in 3%, and an occasional delay in ovulation.