Yutting is levonorgestrel tablets, emergency contraception taking levonorgestrel tablets a capsule is only effective for the previous coitus. It is only effective if taken within 72 hours after sex, and the sooner you take it, the better. Levonorgestrel tablets are a kind of remedy for sexual intercourse without contraception, can be taken within 72 hours of intercourse, the earlier the effect of taking the better. Levonorgestrel tablets are only effective for the first time you have intercourse, and are not effective if you have intercourse after taking the tablets. Levonorgestrel tablets are a hormone-containing medication that has some side effects on the body, so they should not be used as regular contraception. In addition, the specific use of levonorgestrel tablets should be under the guidance of a doctor.