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Antide is a third generation gonadotropin-releasing hormone receptor (GnRHR) antagonist.1,2,3,4 It inhibits GnRH-induced secretion of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and gonadotropin in isolated rat pituitary cells when used at concentrations ranging from 0.001 to 1,000 nM but does not induce histamine release in isolated rat mast cells (EC50 = >300 μg/ml).1,3 Antide (250 μg/kg, i.v.) reduces serum LH and FSH levels in orchidectomized cynomolgus monkeys.2 It inhibits ovulation in rats when administered at a dose of 2 μg/animal.3 Antide (10 μg/animal, s.c.) reduces the intensity and duration of catalepsy induced by haloperidol in rats.4

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