Will the morning after pill work if you have diarrhea day taking it?

It depends. The morning-after pill is most effective when taken as soon as possible after unprotected sex, and studies show that it is effective in preventing pregnancy when taken within 72 hours (3 days). However, taking it with severe diarrhoea or vomiting may reduce its effectiveness, as it may not be fully absorbed into the body.

There are two types of morning-after pills: those that contain levonorgestrel (also called Plan B One-Step, Next Choice One-Dose, Aftera, and Take Action) and those that contain ulipristal acetate (UPA, also called ella or Option 2).

For Plan B One-Step and Next Choice One-Dose, if you have severe diarrhea within 2 hours after taking the morning-after pill:

If you miss your period (are late) by 1 week or more, consider taking a second dose if pregnancy is not wanted.

If you decide not to take a second dose, be sure to use another form of birth control, such as condoms, until you get your period.

If your next period is longer than 7 days later than usual, you may be pregnant. It is recommended that you take a pregnancy test.

For UPA (ella or Option 2), if you have severe diarrhea within 3 hours after taking the morning-after pill:

If you miss your period by 1 week, the pill may not have worked. Consider taking a pregnancy test.

If you decide not to take a pregnancy test, be sure to use another form of birth control, such as condoms, until you get your period.

If you're taking the morning-after pill (levonorgestrel or ella), it's a good idea to be aware of the potential for it to be less effective due to diarrhea or vomiting. If you have severe diarrhea or vomiting within 2-3 hours of taking the morning-after pill, consider taking a second dose or taking a pregnancy test. You can also talk to your healthcare provider or a pharmacist for further information and advice.