Taking three times a month of emergency contraceptive pills belongs to the frequent use of emergency contraceptive pills. Because the emergency contraceptive pill contains a large amount of progesterone, frequent use of emergency contraceptive pills will, because of the exogenous progesterone intake and affect the normal endocrine function of the ovary, resulting in the ovary secretion of estrogen and progesterone level imbalance, so that the normal menstrual cycle, the period and the amount of menstruation change. Due to the intake of large doses of progesterone, it will increase the metabolic burden of the patient’s liver, which will easily cause the patient to show signs of liver function damage. Women who take emergency contraceptive pills frequently may also experience more obvious symptoms such as dizziness, fatigue, nausea and vomiting. Emergency contraceptive pills for women’s physical harm is relatively large, in principle, the number of emergency contraceptive pills should not be taken more than three times a year.