Plan B is a progesterone pill that you take to prevent pregnancies if you've had an accident. In other words, if you forgot to take your pills two or three days in a row and you've had unprotected sex, this is a great option for you to use to prevent pregnancy. If you use the Depo and you forgot to get your injection within that 12-week period and you have unprotected sex, this is an excellent pregnancy prevention option for you. If you're a patient that uses condoms very regularly and you have a condom break, again, this is an excellent way to prevent pregnancy.
The Plan B works best when you use it within the first 12 hours of your contraceptive failure. It is effective up to 72 hours after the failure, but it is most effective within the first 12 hours. So, if you are a patient that is a strict condom user, I highly recommend that you purchase the Plan B and keep it in your medicine cabinet just in case you have a condom failure. If you are going on vacation, in addition to packing condoms, you should pack a prescription for the Plan B. It's important that you have this on hand at all times, so that if you have a condom failure, within the first 12 hours you can take those pills without searching a pharmacy and losing that window of opportunity.