The twenty-four-hour emergency contraceptive pill is called Yutin, and its drug component is mainly mifepristone, which acts as a fast-acting contraceptive by inhibiting ovulation and preventing a pregnant egg from coming to bed. The side effects of the emergency contraceptive pill may include nausea, vomiting, irregular vaginal bleeding and menstrual disorders, so the emergency contraceptive pill should not be taken more often than three times a year. If a woman has not planned to have children for a long time, she can consider taking safe and effective contraceptive measures, such as placing an intrauterine device (IUD) or tool contraception, skin burial contraception, etc. Emergency contraceptive pills should not be taken orally often. Frequent use of emergency contraceptive pills may cause amenorrhea and may even affect fertility.