Hi, Utovlan- Norethisterone contains Norethisterone that is used to delay your menstrual period. Utovlan-Norethisterone contains only Norethisterone, a natural female hormone, progesterone that is also used in the treatment of various menstrual problems such as heavy periods, irregular or painful periods, premenstrual syndrome (PMS), endometriosis, breast cancer etc. It works by preventing the shedding of the womb lining as well as changing the hormone balance during the menstrual cycles and helps to stop your period bleed. Its usual dose is one tablet three times daily that can be taken for delaying your period by up to 17 days. You can start to take this medication 3 days before your expected period date and after stop taking this medication, your period will start within 2-3 days. This medication is safe and effective for long term use if it is taken as directed by your doctor. So, before start or stop taking this medication, you should consult your doctor first. If you experience any side effects from this medication like headache, sweating, dizziness, fatigue, irregular uterine bleeding, spotting or breakthrough bleeding between periods, breast tenderness and enlargement, mood swings or allergic reactions, then you should inform your doctor promptly for medical attention. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician