There are many misperceptions about emergency contraception (EC) and how it works. It is important for patients to understand that Plan B® is similar to a birth control pill and is believed to act as an EC by:
- Preventing ovulation
- Preventing fertilization by altering tubal transport of sperm and/or egg
- Altering the endometrium, which may inhibit implantation
Plan B® is not effective once the process of implantation has begun; it will not affect an existing pregnancy or harm a developing fetus.
For Plan B® to work effectively, it should be taken as soon as possible within 72 hours after contraceptive failure, unprotected sex, or sexual assault. When taken as directed, Plan B® may reduce the risk of pregnancy by up to 89%, and it is proven to be more effective the sooner it is taken.1
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