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Norethindrone, commonly known as the "mini-pill," is a progestin-only oral contraceptive designed to prevent pregnancy. Unlike combination birth control pills, it does not contain estrogen and is particularly suitable for women who cannot take estrogen. Norethindrone works by thickening cervical mucus to hinder sperm movement and altering the uterine lining to prevent a fertilized egg from implanting. In some users, it also prevents ovulation. It is important to take this medication at the same time every day to maximize its effectiveness. While it is more effective than some barrier methods like condoms, it is generally less effective than combination hormone pills. Norethindrone does not protect against sexually transmitted infections. Some users may experience side effects such as irregular bleeding, headaches, and nausea. Available under various brand names like Errin, Jencycla, and Heather, it is intended for individuals aged 16 and older. Always consult healthcare professionals before starting any new medication.