Norethisterone 15mg (CR Tablet) Norethisterone is a synthetic progestogen that regulates the menstrual cycle and manages hormone-related gynecological conditions. The controlled release formulation provides sustained action, better cycle control, and improved patient compliance. Indicated in menstrual irregularities, dysfunctional uterine bleeding, endometriosis, premenstrual syndrome, and for postponement of menstruation.