The 120-hour emergency contraceptive pill is mifepristone, which can be taken orally within 120 hours after sex, and the success rate of this contraceptive pill can not reach 100%, and the success rate can only be about 90%. If it is within 72 hours after life, you can take the emergency contraceptive pill, which is levonorgestrel, if it is more than 72 hours, you can take mifepristone orally, mifepristone can take 25mg or 50mg, there is no big difference between the success rate of 50mg contraception and 25mg contraception. After taking this drug if the arrival of menstrual time did not come, you need to go to the hospital in time to do a checkup to rule out unwanted pregnancy in time.