Yuting generic name levonorgestrel tablets, take levonorgestrel after not menstruation may be pregnancy or drug-induced endocrine disorders caused by delayed menstruation, you need to go to the regular medical institutions for relevant examinations, to clarify the cause of the cause of the observation or drug treatment. 2 weeks after taking levonorgestrel tablets and still no menstruation, you need to go to the medical institution, check the blood HCG, to rule out pregnancy, will also require examination of gynecological ultrasound, to understand the thickness of the lining, or the size of the fetal sac. If it is a pregnancy, it is recommended to consult a doctor in time to take the next step in the treatment. After ruling out the possibility of pregnancy, when the thickness of the lining reaches the requirement for menstruation, progesterone can be used for withdrawal bleeding. If menstruation still does not come, it is important to actively search for other possible causes for the lack of menstruation. Levonorgestrel tablets are emergency contraceptives for women, which have a disrupting effect on the female endocrine system, but the contraceptive effectiveness is not 100%, and may also lead to pregnancy and menstrual disorders. Therefore, it is recommended to take levonorgestrel tablets up to 3 times a year, otherwise it has a significant effect on the human endocrine system.