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Hi, I had unprotected extramarital sex and took a Plan B within 12 hours of the sex. How effective is Plan B?

Taking the product within the first 24 hours is the best way to ensure it is 95% effective. It is important to take it as soon as possible, as the effectiveness decreases the longer you wait. For more information, please visit the website planb.ca/faq.html. I hope this helps.