Emergency contraception is not used as a regular contraceptive and its frequent use can lead to menstrual disorders in women. Emergency contraception is usually used as a remedial measure. It is also known as PlanB in foreign countries. Emergency contraception can be used in the hours and days after unprotected sex and is based on the principle of preventing conception when the fertilized egg has not yet settled in the uterus after fertilization. The most commonly known is the oral emergency contraceptive pill, a drug called Yutin, which can be bought in pharmacies without a prescription and can be taken orally within 72 hours of sexual intercourse and repeated 12 hours later, with a 2% chance of failure. Other than that, there are some other measures, but you need to seek the help of a doctor at a hospital family planning specialist. Mifepristone is an anti-pregnancy medication that can be taken 5 days after sex and has a 0.5% chance of failure. Another method is to have a copper intrauterine device placed in the hospital within 5 days after sex to prevent the fertilization of the egg, which has a 0.1% chance of failure. In conclusion, emergency contraception should not be used as a regular contraceptive measure, and it is more important to do a good job of daily contraception.