Hello, This medication is used to treat women with abnormal bleeding from uterus from imbalance of hormones, endometriosis (condition in which tissue that normally lines the inside of the uterus is found outside the uterus in the abdomen/pelvic area, causing painful/irregular periods) and women who have stopped having menstrual periods (amenorrhea). Side effects: Nausea, vomiting, headache, dizziness, mood swings, trouble sleeping, weight gain/loss, acne, breast swelling/tenderness, change in sexual interest, unwanted hair growth, or hair loss may occur. Norethindrone is a type of female hormone (progestin). It is like the hormone progesterone that your body makes naturally. This medication works by stopping the normal growth of the uterus lining during the menstrual cycle and signalling hormone changes in the uterus to restore normal menstrual periods. This medication must not be used to test for pregnancy. Progestins are not effective in preventing miscarriages. For the treatment of stopped menstrual periods and abnormal bleeding from the uterus, this drug is usually taken once daily for 5-10 days during the second half of the planned menstrual cycle or as directed by your doctor. Even though this medication has some side effects, please remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Enton Dore, General & Family Physician