The instructions for levonorgestrel enteric-coated tablets recommend taking 1 tablet, and the risk of adverse reactions may increase if two tablets are taken. Levonorgestrel enteric-coated tablets is a kind of female emergency contraceptive pill, the instructions for the use of the medication show that within 72 hours after intercourse to take 1 tablet, if the oral administration of two tablets, the chances of adverse reactions will be greatly increased, there may be nausea, vomiting, dizziness, breast pain, fatigue, etc., but also can occur in the menstrual cycle disorders, uterine bleeding abnormalities, etc.. Levonorgestrel enteric-coated tablets taking two tablets can also produce pharmacological toxicity, prompting ovarian non-ovulation, thinning of the uterine lining, abnormal ovarian secretion function. People with breast cancer, cancer of reproductive organs, abnormal liver function, cerebrovascular accident, hypertension, diabetes, mental depression are prohibited from taking the drug. Levonorgestrel enteric-coated tablets should be used under the guidance of a doctor, the drug can not be used as a regular contraceptive.