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Human menopausal gonadotropin (hMG, 75 IU/body/day) and a gonadotropin-releasing hormone (GnRH) agonist buserelin (1, 10, 100 µg/kg/day) were simultaneously administered to female rabbits by the subcutaneous route for 7 days, and the effects on organ weights, plasma hormones and weight of ascitic fluid were examined. Treatment with hMG increased the ovarian weight, plasma estradiol and weight of ascites, thus indicating that ovarian hyperstimulation syndrome had been induced. Simultaneous treatment with buserelin decreased the changes induced by hMG. GnRH agonists can thus be surmised to reduce the severity of ovarian hyperstimulation syndrome in the rabbit. However, caution is needed when extrapolating the results of this rabbit model to humans.