Figure 1. Success rate of bromocriptine in amenorrhea. If hyperprolactinemia is the cause of amenorrhea, the chances of restoring normal gonadal function with bromocriptine are very good. After 1 month of treatment, one woman in four will return to normal menstrual cycling; within 2 months, this number will increase to six out of 10; and after 10 months, eight out of 10 women will be menstruating normally. (Most of the remaining 20% have had pituitary surgery and irradiation therapy and are gonadotropin-deficient.)