During a 10-year period, 428 women received clomiphene citrate according to a graduated therapeutic regimen in which the dose of clomiphene and the laboratory studies were individualized according to each patient's history, examination and response. Of the 428 patients, 85.3% ovulated and 42.8% conceived. The great majority of those who conceived did so during the first three ovulatory cycles. There was no evidence that clomiphene therapy was associated with the induction of another cause of infertility. Overall, 88.2% of those with no other causes for infertility who ovulated also conceived. However, only 7.8% of those who had one or more factors in addition to anovulation became pregnant. There was no evidence that clomiphene adversely affected the postcoital test, as only 15% of the patients had poor cervical mucus. The low rate of complications of this treatment, 5.1% cyst formation as well as the 14% abortion rate and the 2.6% congenital anomaly rate and the excellent gestational outcome in those who conceived support the use of this treatment regimen.