Yutin is an emergency contraceptive pill, and this drug can be used as a contraceptive for unprotected sex up to 72 hours, and it does not work beyond 72 hours. However, this drug contraceptive success rate can reach 85%-90%, so there can be more than 10% of people may have contraceptive failure. The side effects of this drug are also relatively large, after eating it mainly inhibits the disorder, in addition, changes the normal environment in the uterine cavity, so it can cause non-pregnancy, in order to mention the role of contraception. Therefore, this drug is highly likely to cause endocrine disorders, menstrual disorders and irregular vaginal bleeding, and cannot be applied as a regular contraceptive measure.