Effects of Plan B

Plan B One-Step™ (levonorgestrel) is an emergency contraceptive used to prevent pregnancy after unprotected sex.
The effects of Plan B on the body are primarily to stop ovulation (the maturation and release of eggs from the ovaries) and prevent fertilization of the egg if ovulation has already occurred. This medication also alters the lining of the uterus (the endometrium), making it less receptive to a fertilized egg. However, if a fertilized egg has already implanted into the uterus, Plan B will not cause an abortion.
Taking Plan B within 72 hours after unprotected sex reduces the risk of pregnancy by 89 percent. Although most women do not have any problems with this contraceptive, it is not suitable for everyone. Possible side effects of Plan B include headaches, nausea, and fatigue.
(Click Plan B for a more in-depth look at the effects of this contraceptive, including information on how it works, general safety concerns, and potential side effects.)
Last reviewed by: Kristi Monson, PharmD
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