Yutin can achieve effective contraception by taking one tablet within 72 hours after sex and repeating the dose with one tablet in 12 hours. Yutin belongs to the emergency contraceptive pill, after unprotected sex or within a few hours or 3 days after the failure of contraception, to prevent the occurrence of unwanted pregnancy using remedial contraception, usually taken on an empty stomach or 2 hours after eating. The emergency contraceptive pill is a sex hormone drug, and withdrawal bleeding and menstrual disorders can occur after taking the pill, which do not require treatment and will return to normal after the next menstruation; however, it should not be used frequently, otherwise it will cause endocrine disorders, so it is recommended to use it no more than 3 times in a year and not 2 times in a month. The adverse effects of emergency contraceptive pill are nausea, vomiting, dizziness, breast pain, irregular vaginal bleeding, early or delayed menstruation. Therefore, women who do not have the requirement to have children should take good contraceptive measures to avoid unintended pregnancy, which can cause physical and mental harm.