Levonorgestrel is an emergency contraceptive pill that can be used for up to 72 hours of sexual intercourse, if no contraception is used. However, the success rate of this emergency contraceptive pill can only reach 85%-90%, so after taking this pill, there are about 10% of people who are unsuccessful. After taking the pill, if you don’t get your period, you should go to the hospital for a checkup. This pill can not be used as a regular contraceptive measure, this pill can only be taken 3 times a year, only 1 time a month, eating too much will cause endocrine disorders.