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https://www.sciencedirect.com/science/article/abs/pii/S0002937801111993#:~:text=Emergency%20contraceptive%20pills%20have%20a%20favorable%20success%20rate,contraceptive%20were%20administered.%20%28Am%20J%20Obstet%20Gynecol%202001%3B184%3A531-7.%29
https://pubmed.ncbi.nlm.nih.gov/11262449/
The effectiveness rate varied from 87% to 90% for the <72-hour group and from 72% to 87% for the 72- to 120-hour group. In both groups the chi (2) tests showed that emergency contraceptive pills significantly reduced the risk of pregnancy. Conclusions: Women should be encouraged to seek consultation as quickly as possible after unprotected sexual intercourse.
https://www.who.int/news-room/fact-sheets/detail/emergency-contraception
ECPs with UPA are more effective between 72–120 hours after unprotected intercourse than other ECPs. Safety Side effects from the use of ECPs are similar to those of oral contraceptive pills, such as nausea and vomiting, slight irregular vaginal bleeding, and fatigue.
https://walrus.com/questions/does-the-morning-after-pill-work-after-72-hours
It may still work if you take it more than 72 hours after unprotected sex, but is not nearly as effective in preventing unplanned pregnancy as compared to taking it within 72 hours. Within 24 hours, it is nearly 95% effective. Within 72 hours, it is 87-90% effective. By 96 hours (4 days), it is 72-87% effective.
https://www.sciencedirect.com/science/article/pii/S0002937801111993
Results: The pregnancy rate was 0.8% for the <72-hour group and 1.8% for the 72- to 120-hour group. The effectiveness rate varied from 87% to 90% for the <72-hour group and from 72% to 87% for the 72- to 120-hour group.
https://www.aafp.org/afp/2004/0815/p707.html
Some authors suggest that emergency contraception may have some benefit beyond 72 hours after unprotected intercourse, 22 – 24 but that option should be evaluated for each patient. The data do ...
https://www.jwatch.org/wh200105140000001/2001/05/14/emergency-contraception-still-effective-after-72
The effectiveness of emergency contraception (EC) -- including norgestrel plus ethinyl estradiol (the Yuzpe method) and levonorgestrel alone -- within 72 hours after unprotected coitus has been documented by well-designed clinical trials.
https://www.cdc.gov/reproductivehealth/contraception/mmwr/spr/emergency.html
Emergency contraception consists of methods that can be used by women after sexual intercourse to prevent pregnancy. Emergency contraception methods have varying ranges of effectiveness depending on the method and timing of administration. Four options are available in the United States: the Cu-IUD and three types of ECPs.
https://www.enteromedics.com/can-i-take-birth-control-pills-72-hours-after/
The emergency contraceptive pill (ECP) is a pill that can be taken up to 120 hours (5 days) after unprotected sex, often referred to as the morning-after pill. When taken within 72 hours (3 days) after sexual activity, some types of emergency contraception work best.
https://www.nhsinform.scot/healthy-living/contraception/emergencies/emergency-contraception
There are 2 kinds of emergency contraceptive pill. Levonelle has to be taken within 72 hours (3 days) of sex. ellaOne has to be taken within 120 hours (5 days) of sex. Both pills work by preventing or delaying ovulation (release of an egg). Emergency contraception is best taken as soon as possible to be effective.
https://www.plannedparenthood.org/learn/morning-after-pill-emergency-contraception/which-kind-emergency-contraception-should-i-use
The best emergency contraception (EC) for you depends on a few things: How long it’s been since you had unprotected sex — you have up to five days after unprotected sex to use emergency contraception. Plan B works better the sooner you take it. Plan B doesn’t work nearly as well after three days (72 hours).
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