Taking an emergency contraceptive pill is harmful for about 1 month, and there may also be individual differences. Taking emergency contraceptive pills is a remedy for unprotected sex, which can be taken within 72 hours after intercourse under the guidance of a doctor. Due to the high dosage of emergency contraceptive pills, side effects such as irregular vaginal bleeding and menstrual disorders can occur after taking the pills, which usually lasts for about 1 month, but individual differences may also exist. Contraindications such as hepatic and renal insufficiency and cardiovascular disease should be ruled out before taking the pill. Because of the high hormone dose of the emergency contraceptive pill, the contraceptive effect is not as good as the conventional contraceptive method and it is only effective for one unprotected sex, so it is not recommended to be used as a conventional contraceptive method, and it is also necessary to rule out the possibility of pregnancy when menstruation exceeds the period of one week or more after the taking of the pill.