Patients failing to ovulate and conceive on clomiphene citrate (CC) or CC plus human chorionic gonadotropin (hCG) or patients with pituitary gonadotropin deficiency are candidates for human menopausal gonadotropin (hMG) plus hCG therapy. The duration and number of ampules needed to stimulate ovarian response leading to ovulation and/or pregnancy vary individually. Seventy-one patients who had complete follow-up evaluation and accurately documented body weights at the time of therapy were considered for the study. Of these 71 patients, 41 (57.3%) conceived in 293 cycles. The average number of ampules of hMG used by patients with 10% to 20% below ideal body weight (IBW) was 13.9 +/- 6.3 (mean +/- standard deviation [SD]). The average number of ampules used by patients with normal +/- 10% IBW was 14.2 +/- 3.5. Patients who were overweight by 10% to 25% used 15.3 +/- 5.4 ampules, and patients overweight by greater than or equal to 25% used 20.9 +/- 5.6 ampules of hMG. Eleven patients with severe hypothalamic chronic anovulation needed an average of 20.6 +/- 6.2 ampules. The data reveal a direct relationship between IBW and the amount of hMG needed to induce ovulation and/or pregnancy; however, in the presence of chronic hypoestrogenic conditions, it is expected that these patients will need higher amounts of hMG, regardless of body weight.