Levonorgestrel tablets are emergency contraceptives, which are usually taken within 72 hours after intercourse. If taken frequently, they may have adverse effects on the body, and may cause gastrointestinal discomfort, such as nausea and vomiting, as well as dizziness and other discomforts. Levonorgestrel tablets can also cause endocrine disorders, such as irregular bleeding in the vagina, delayed menstruation, prolonged menstrual disorders, or even amenorrhea, which can easily affect ovulation and cause infertility. You must do a good job of contraception, not often take levonorgestrel tablets this contraceptive pill, so as not to cause infertility, taking emergency contraceptives can not be more than three times a year, it is recommended to take condoms, the contraceptive ring and other contraceptive methods for contraception, which is safer.