Yohtex, also known as levonorgestrel tablets, is an emergency contraceptive pill with a contraceptive success rate of around 80-90%. Levonorgestrel tablets are used when there is an accidental failure of unprotected or other contraceptive methods, and the method of use is to take it within 72 hours after sex, the earlier the pill is taken, the better the contraceptive effect. However, there will be women who take the wrong or the drug for each person’s individual differences caused by contraceptive failure, its success rate is about 80%-90%. Taking levonorgestrel tablets may occur menstrual changes, nausea, vomiting and other gastrointestinal discomfort, breast swelling and pain and other adverse reactions, generally do not need to deal with. Levonorgestrel tablets are emergency remedies for contraceptive errors and should not be used as regular contraceptives and are not recommended for frequent use. If vomiting occurs within 2 hours after taking the pill, 1 additional tablet should be taken immediately. Levonorgestrel tablets are contraindicated in women who are already pregnant, and are contraindicated in women with breast cancer, cancer of reproductive organs, abnormal liver function, venous thrombosis, cardiovascular and cerebral vascular diseases, diabetes mellitus, hyperlipidemia, psychiatric depression, and women over 40 years of age. The specific use of levonorgestrel tablets in the clinic should be taken under the guidance of a doctor.