Yutin is effective when taken within 72 hours after a woman has unprotected sex, and the earlier it is taken the better the contraceptive effect. Yutin can change the hormone secretion of the ovaries, thus changing the time of ovulation, and play a role in inhibiting pregnancy. When women do not take contraceptive measures for sex, and do not want to get pregnant, you can take Yutin contraception. Women need to fast for 2 hours when taking Yutin to reduce nausea, vomiting and other gastrointestinal reactions; and Yutin’s contraceptive effect is generally about 85%, may lead to contraceptive failure, and can not be taken often, so as not to lead to menstrual disorders, which is not conducive to women’s health, it is recommended that the number of times a year should not exceed 3 times. Yutin is an emergency contraceptive pill, and can not be used as a regular contraceptive measures, otherwise it will easily lead to endocrine disorders.