used to treat the absence or irregularity of menstrual periods. It is a prescription medicine. This medicine works by?preventing?the release of eggs from the ovaries. Cidolut Nor is also used to treat abnormal growth of tissue in the uterus caused by?endometriosis. It is also used to treat abnormal uterine?bleeding?caused by hormonal imbalance. Cidolut Nor is also used to prevent?pregnancy. This medicine works by preventing the entry of sperm into the uterus. This medicine is usually taken as a?contraceptive?by women who cannot use other forms of birth control such as estrogen.