Levonorgestrel tablets are both emergency contraceptives. The difference between two tablets and one tablet is that the dose of one tablet is on the large side, one tablet is taken within 72 hours after sex, to play a good contraceptive effect, two tablets loaded with levonorgestrel tablets after sex first take a tablet, and then take the second tablet 12 hours later, mainly to reduce the gastrointestinal side effects of emergency contraceptives, to ensure that the drug is very well absorbed, and thus better to play a contraceptive effect. Whether women take two tablets or a pack of levonorgestrel tablets, is a contraceptive failure protection measures, but women can not often take, often take it will easily lead to women have contraceptive failure, menstrual disorders, is not conducive to women’s health. If women do not want to get pregnant, it is best to use other contraceptive measures, such as intrauterine devices and condoms.