Subcutaneous pulsatile long-term administration of low doses of gonadotropin-releasing hormone (GnRH) was given for induction of ovulation to 14 infertile amenorrheic women who did not respond to clomiphene citrate. A small peristaltic pump was used to deliver 1, 5, or 20 micrograms of GnRH every 90 minutes. Nineteen treatment courses with a duration of 26 to 187 days were given. Thirty-six ovulatory cycles were induced in 12 of the 14 women; 8 of the women conceived. Five healthy children have been born. Three early spontaneous abortions occurred. The subcutaneous GnRH therapy was given with the same pulse frequency until menstruation or pregnancy occurred. The treatment could be given without interruption to induce repeated ovulatory menstrual cycles. No serious adverse effects occurred. Subcutaneous pulsatile administration of low doses of GnRH is a promising new treatment of women with anovulatory infertility.