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 fertilization of the egg. Adverse effects may include nausea, vomiting, withdrawal bleeding, early or delayed menstruation, etc. It is caused by endocrine disruption due to the foreign hormones contained in the emergency contraceptive pill, which interfere with the normal hormone secretion in the body. Emergency contraceptives should not be used repeatedly and frequently, as these exogenous estrogens can suppress the endocrine function of the ovaries and lead to endocrine dysfunction. Generally, it should not be taken more than three times a year, and it is recommended to use it on an empty stomach or at bedtime. Avoid taking it together with other drugs to avoid affecting its effectiveness, pay attention to a light diet and avoid spicy and stimulating foods.