There are many types of emergency contraceptives available in the clinic, and the most commonly used are the following: levonorgestrel tablets, gold yutin, and compound progesterone tablets, mifepristone tablets, etc. According to the different components, in fact, emergency contraceptives are mainly divided into three categories: first, mainly progestin-based contraceptives represented by the drug, mainly Yutin. Second, mainly a combination of estrogen and progestin emergency contraceptive pills, such as compound progesterone tablets. Third, it is mainly a contraceptive pill with mifepristone as the main ingredient, the name is mifepristone tablets. The first two types of emergency contraceptive pills are required to be taken by patients within 72 hours after unprotected sexual intercourse. The third type of emergency contraceptive pill is effective when taken within 120 hours after intercourse without measures.