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Nafarelin is an agonist of gonadotropin-releasing hormone (GNRH). It is a long-acting agent that, after an initial increase in sex hormone levels, decreases the level of circulating gonadotropins and sex hormones. In vivo, nafarelin (0.5-2.0 μg/kg, s.c.) reduces plasma levels of luteinizing hormone and testosterone as well as testicular volume, sperm count, sperm motility, and duration of ejaculation in male dogs. Nafarelin (32 μg/animal per day) inhibits estrus in female beagle dogs. It also reduces the volume of endometrial tissue in a rat model of endometriosis. Formulations containing nafarelin have been used in the treatment of endometriosis and central precocious puberty.

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