Levonorgestrel tablets are emergency contraceptives, used within 72 hours of unprotected sex. The sooner you take it, the better it works. There are 1.5mg and 0.75mg pills, so if it’s 1.5mg, you can take it once, and if it’s 0.75mg, you can take it again every 12 hours after the first dose. The contraceptive success rate of this drug is more than 90%, but there are many contraceptive failures. It is recommended that you go to the hospital as soon as possible after your menstrual period, if you do not have it. When you take this pill, you should not eat or drink for two hours before and after taking it so as not to reduce the effectiveness of the pill.