Menorrhagia is the most frequent symptom in women with leiomyomata uteri. We induced transient hypoestrogenism with a gonadotropin-releasing hormone agonist, goserelin (Zoladex, I.C.I.), in a depot formulation, to resolve severe anemia in 16 women with uterine myomas. Subcutaneous administration of goserelin 3.6 mg was repeated every 28 days for 6 months. Thirteen patients became amenorrheic in 5 weeks and 3 reported scanty bleeding. Estradiol fell to postmenopausal levels after one month's treatment with hormonal surges on only three occasions. Uterine volume decreased by 49% after 3 months' treatment but subsequent reduction was not achieved. Mean hemoglobin rose from 7.4 g/dl pretreatment to 13.2 g/dl at 3 months (+78.3%) and mean hematocrit from 26.1% to 39.8% (+52.4%) without any further improvement. Serum ferritin increased constantly during the 6 months. Goserelin depot therapy in severely anemic patients with leiomyomas and menorrhagia is practical, safe and may avoid the need for preoperative transfusion.