Priminor N 5mg Tablet treats a variety of menstrual issues, including painful, heavy, or irregular periods, premenstrual syndrome (PMS), and endometriosis. Priminor N 5mg Tablet is a synthetic progestin that mimics the effects of a natural female hormone called progesterone. It can be used to treat premenstrual syndrome (PMS), however it is not usually advised for that purpose. It may help to alleviate PMS symptoms such as mood swings, anxiety, fatigue, bloating, breast tenderness, and headaches. Lifestyle adjustments such as regular exercise, a good diet, adequate sleep, and relaxation techniques may also be beneficial.