Emergency contraceptive pills are effective contraceptive measures taken in case of emergency and cannot be taken continuously for two months. As this kind of drug works in a short time, the concentration of the drug is relatively large and the hormone content is relatively high, if it is taken continuously, it may cause constant vaginal bleeding, hemorrhage, menstrual disorders, endocrine disorders and other conditions, and it may aggravate the condition of the patients who have poor liver and kidney functions, varicose veins or thrombosis diseases. Therefore, this kind of drug not only can’t be taken continuously, but also too many times in a year or for a long period of time, will lead to the occurrence of adverse reactions, which will have a serious impact on women’s health.