It's safe to take Plan B as many times as you need to prevent pregnancy after unprotected sex. However, you might choose a regular form of birth control.

What is Plan B and how does it work? Do morning after pills have a shelf life? Are they abortion pills? What you need to know about the birth control pill.

What are the effectiveness and side effects of Plan B, the morning-after pill. Understand how this emergency contraception option works and its potential impacts on your health.