Levonorgestrel tablets belong to the emergency contraceptive pill, usually taken within 72 hours after intercourse, if often taken will have an adverse effect on the body, taking the pill is easy to cause gastrointestinal discomfort, such as nausea, vomiting, and dizziness and other discomforts, after stopping the drug, this symptom will disappear on its own, without special treatment. Levonorgestrel tablets can also cause endocrine disorders, such as irregular vaginal bleeding, but also cause menstrual delay, prolonged menstrual disorders, or even amenorrhea, which can easily affect ovulation, can cause infertility. Usually must do a good job of contraceptive measures, can not often take levonorgestrel tablets this contraceptive, so as not to cause infertility, taking emergency contraceptive pills can not be more than 3 times a year, it is recommended to take a condom, contraceptive ring and other contraceptive methods for contraception, so that it is safer.