Plan B Medication Information

Plan B One-Step™ (levonorgestrel) is an emergency contraceptive used to prevent pregnancy in women who have had unprotected sex. However, because Plan B is not suitable for everyone, make sure to review the prescribing information on this medication before starting treatment.
For example, you should talk with your healthcare provider before taking Plan B if you have certain medical conditions, such as diabetes or certain allergies. Although most women do not experience problems with this medication, Plan B can cause side effects -- common ones include nausea, fatigue, and headaches.
If a fertilized egg has already implanted into the uterus, Plan B will not cause an abortion.
(Click Plan B for a more in-depth look at important information on this medication. This article discusses how Plan B works, lists possible side effects, and offers some general tips on when and how to take it.)
Last reviewed by: Kristi Monson, PharmD
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