How effective is Plan B?
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The morning-after pill Plan B is most effective (>97%) when taken within 24 hours of unprotected sex and 75%-89% effective if you take it within three days.
Taking Plan B at the appropriate time after unprotected intercourse can help prevent unwanted pregnancies.
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How Long Does Plan B Stay in Your System?
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Plan B Emergency Contraception, NYS Approved OB/GYN, Brooklyn, NYC
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What you need to know about Plan B
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What is Plan B? Get the Facts!
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How Does Plan B Work?
![](https://media.self.com/photos/59efa5c486e0031f4c9a4761/master/pass/High-BMI-Women-Contraception.jpg)
What the Heck Are High-BMI Women Supposed to Do About Emergency Contraception?
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Plan B (Morning After Pill): 15 Effects and Effectiveness Facts – EverCup
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How Does Plan B Work, and Is It Always Effective?