Oral emergency contraceptive pills contain a large amount of hormones, one pill is equivalent to eight days of short-acting contraceptive pills. It can inhibit ovulation and prevent the fertilization of the egg, and the adverse reactions will include nausea, vomiting, withdrawal bleeding, early or delayed menstruation and so on. Because emergency contraceptive pills contain foreign hormones, interfere with the body’s normal hormone secretion, endocrine disruption and caused. Emergency contraceptive pills can not be used repeatedly and frequently, these exogenous estrogen will inhibit the ovarian endocrine function, resulting in their own endocrine function disorders. Generally, it should not be taken more than three times a year, and it is recommended to use it on an empty stomach or before going to bed during the period of taking the pill. Avoid taking it with other drugs to avoid affecting the effectiveness of the drug, pay attention to a light diet, avoid spicy and stimulating food.