For Healthcare Professionals > Plan B One‑Step® How Plan B Works Plan B Side Effects Taking Plan B Countdown Calculator Find a Store How to Save Frequently Asked Questions You want answers. We made it easy and put them all in one place. The basics of Plan B Expand all What is Plan B? How effective is Plan B? Does Plan B work for women with a BMI over 25? How does Plan B work? Will Plan B affect my fertility or ability to get pregnant in the future? What happens if I’m already pregnant and I take Plan B? Can I continue to take my regular birth control after taking Plan B? Taking Plan B Expand all When should I use Plan B? How soon after unprotected sex should I take Plan B? How do I take the Plan B pill / Can I take Plan B with food and/or water? Can I take Plan B if I’m breastfeeding? How often can I take Plan B? Is there a limit to how many times you can take Plan B in a year/lifetime? I had another incident of unprotected sex the day after taking Plan B. Am I still covered? When is it not appropriate to use Plan B? What are the possible side effects of Plan B? Do certain medications affect how well Plan B works? Getting Plan B Expand all Do I need a prescription to get Plan B? Do any states have restrictions on buying Plan B? Where can I buy Plan B? Can I buy Plan B online? Is there any way to save on Plan B? How do I talk to my friend, family member, or partner about taking Plan B? What other resources can I turn to for information about Plan B and emergency contraception? Contact Us FAQs News & Media Resources Privacy Notice Terms of Use Site Map Instagram Facebook YouTube Twitter Use as directed. Plan B One‑Step is a registered trademark of Foundation Consumer Healthcare. © 2020 Foundation Consumer Healthcare. This site is intended for US audiences only.