The generic name of Yuketin is Levonorgestrel Tablets. It is effective for women to take levonorgestrel tablets during ovulation. Levonorgestrel tablets are commonly used for emergency contraception in women, especially during ovulation. Levonorgestrel tablets can inhibit ovulation, interfere with the normal transformation of the uterine lining, and accelerate the operation of the pregnant egg, so that the development of the pregnant egg and the development of the uterine lining is not synchronized, is not conducive to the development of the pregnant egg, to achieve the purpose of contraception. It should be taken within 72 hours of unprotected sex or failure of other contraceptive measures, and the earlier it is taken, the better the contraceptive effect. It is prohibited for those who are allergic to levonorgestrel tablets, prohibited during pregnancy, and prohibited if there is breast cancer, cancer of the reproductive organs, abnormal liver function and so on. After taking levonorgestrel tablets may appear mild class early pregnancy reaction, such as nausea, vomiting, breast tenderness, headache, dizziness, fatigue and other discomfort. If a vomiting reaction occurs within 2 hours after taking the medicine, a replacement tablet should be taken immediately. If medication is required, it is recommended to take it under the supervision of a doctor.