Taking levonorgestrel tablets will usually be successful, levonorgestrel tablets contraceptive success rate can be as high as about 90%, usually as long as the use of this drug in the effective time after sexual intercourse, can play a role in contraception. Levonorgestrel tablets emergency contraception, it is recommended to use within 72 hours after sexual intercourse, the earlier the time of using the drug to prevent the effect will be better. After using the drug may appear slight vomiting nausea, dizziness and other uncomfortable symptoms, without special treatment will generally disappear naturally, pregnancy is prohibited the use of this drug. Levonorgestrel tablets have a high level of hormones, after taking this drug may occur endocrine disorders, menstrual changes and even amenorrhea. It is recommended to use this drug under the guidance of a doctor, or follow the doctor’s instructions to use the correct method of contraception to avoid serious effects.