• Eight girls with central precocious puberty were treated with the long-acting gonadotropin releasing hormone analogue leuprolide acetate (Lupron) for a period of six to 18 months. Suppression of gonadotropin and estradiol secretion and regression of secondary sexual characteristics and menses were observed while patients received a subcutaneous dose of 35 to 40 μg/kg/d. Growth velocity was slowed in all but one patient, and the rate of skeletal maturation was slowed even more, resulting in a stabilization or improvement in predicted adult height. There were no major side effects. Although the long-term effects of leuprolide therapy cannot be determined with this study, it appears to be efficacious in the treatment of central precocious puberty.