Holidays and Traditions How long is Plan B good for on the shelf? How long is Plan B good for on the shelf? 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.5 Feb 2021 Related Posts:Is Shakeology still good to drink? Does it last long?How long does the shelf life of castor oil last?Expired Aloe Vera Gel - The Magic Wears Off.What's the shelf life of Symbicort?