Fifty-one patients with proven anovulatory infertility were treated for four months. For two months each, a dose regimen of 50 mg of clomiphene citrate daily for five days and one of 150 mg daily for five days was prescribed. During one month of each of these two regimens, each patient also received 5000 IU of human chorionic gonadotropin intramuscularly. Thirty-three of the 51 patients ovulated at least once during the four months of treatment; the ovulation rate was 64.7%. Sixteen pregnancies occurred during the treatment, for a pregnancy rate of 31.4%. Human chorionic gonadotropin did not appear to increase the ovulation rate.