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Norethindrone Acetate Ethinyl Estradiol is a combination of two hormones used in birth control pills. Norethindrone Acetate is a progestin and Ethinyl Estradiol is an estrogen, which work together to prevent pregnancy by inhibiting ovulation and thickening cervical mucus. It may also be used for other medical conditions such as treating irregular periods, endometriosis, and acne.*