Emergency contraceptive pills are taken shortly after unprotected intercourse in order to prevent from becoming pregnant. About 25% of the woman who take the progestin-only pills have nausea and about 5% vomit. About 50% of women who use combined ECPs experience nausea and 20% vomit. If you vomit within 1-2 hours after taking the pills, you should probably repeat the dose you took.

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