Does Plan B expire? Yes, and it may be less effective if you

Does Plan B expire? Yes, and it may be less effective if you take it
INSIDER
2/5/2021
insider@insider.com (Sarah Fielding,Lauren Demosthenes)
© Kanawa_Studio/Getty Images
For Plan B to be most effective, take it as soon as possible after unprotected sex. Kanawa_Studio/Getty Images
Plan B has an expiration date of about four years. 
Taking expired Plan B is not dangerous, but it may be less effective in preventing pregnancy.
To prolong the life of Plan B, keep the pill away from humid, hot, or bright environments. 
Plan B is a form of emergency contraception that prevents unwanted pregnancies after having unprotected sex. Plan B is most effective when taken within 72 hours and works to prevent pregnancy by delaying ovulation. 

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