NAFARELIN treats the symptoms of endometriosis. It works by decreasing the amount of estrogen your body makes, which reduces heavy bleeding and pain. It may also be used to treat a condition that causes early puberty. It works by decreasing levels of the hormones estrogen and testosterone in the body. This slows or stops signs of puberty while you are taking this medication.

With the Patient Assistance Program from Pfizer, you can receive your medication at no cost.