Emergency contraceptive pills are still effective when taken at 48 hours. Emergency contraceptive pills can be taken within 72 hours or within 120 hours, so taking them at 48 hours is effective.
Emergency contraceptives such as cotrimoxazole and levonorgestrel are taken within 72 hours of unprotected intercourse; mifepristone is taken within 120 hours of intercourse. But the sooner either is taken, the more effective it is.
It should be noted that levonorgestrel is contraindicated in known or suspected pregnancies; compound norethindrone with levonorgestrel is contraindicated in patients with breast cancer, cancer of the reproductive organs, and abnormalities of liver function; mifepristone is contraindicated in patients with cardiac, hepatic, and renal diseases, as well as in patients with adrenocortical insufficiency.
In addition, after taking the emergency contraceptive pill may have vomiting, nausea and menstrual disorders and other side effects, usually do not need to deal with. If vomiting occurs after taking the pill, the same dosage of the drug should be replaced and anti-emetic drugs should be added.
Emergency contraception is a one-time remedy, not a substitute for regular contraception, and its prevention of pregnancy is not 100%, so regular contraception is recommended.