Norinyl 1/50 is part of the Estrogen / Progestin Combinations class and treats Birth Control. Estrogen / progestin combinations are used for birth control, estrogen replacement, and to treat menopause, osteoporosis, PMDD, and acne. They work by preventing ovulation, increasing estrogen levels, and changing hormone levels. Norinyl 1/50 is only available as a brand name drug.