How long is the effectiveness of emergency contraception pills?

Patient's question:

Medical Description: Please ask if you cannot eat anything two hours before and after taking birth control pills?
History of Treatment and Effect: Haven't tried it before.
Desired Help: Hope to get an accurate answer. Thank you.

Doctor's answer:

Hello, taking emergency contraception after cohabitation is effective within 72 hours, but its contraceptive efficacy is about 85%. If taken within 12 hours after cohabitation, its contraceptive efficacy can reach 95%. Emergency contraception can affect the menstrual cycle, potentially causing it to come earlier or later, with variations in flow volume—more or less—and it may lead to menstrual disorders. In severe cases, it can even cause infertility. Taking emergency contraception should not be used as routine contraception; it should only be taken once per menstrual cycle and no more than three times per year. Taking it frequently in a short period can disrupt the menstrual cycle and reduce its effectiveness.

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