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How does Plan B work?

The synthetic (artificial) hormones are the same hormones used in many birth control pills to prevent pregnancy. The hormone used in Plan B changes the body’s signals so that pregnancy is prevented by temporarily stopping the release of an egg from a woman’s ovary, or it may prevent fertilization. It may also prevent a fertilized egg from attaching to the uterus.

The Plan B pill is not effective in terminating an existing pregnancy or an ectopic (tubal) pregnancy.