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How long until plan b is not effective?

Plan B OneStep is most effective the sooner it is started. When taken as directed (within 72 hours of unprotected sex or contraceptive failure), Plan B OneStep is about 89% effective in reducing the chance of pregnancy.

How effective is Plan B one-step? Plan B OneStep is most effective the sooner it is started. When taken as directed (within 72 hours of unprotected sex or contraceptive failure), Plan B OneStep is about 89% effective in reducing the chance of pregnancy.

What are the symptoms of a Plan B? A surprising fact about Plan B is that some of its side effects may actually mimic several pregnancy symptoms. Vomiting, nausea, cramps, sore breasts, abdominal discomfort and headaches are all symptoms that are experienced when women conceive.

When is Plan B effective? If taken within 72 hours of unprotected sex, Plan B is 89 percent effective at preventing pregnancy, according to Planned Parenthood. The drug is less effective after three days, but can work up to five days after unprotected sex.

How effective are Plan B pills? Plan B is typically effective in the first 72 hours and is 95% effective if taken within the first 24 hours of unprotected sex. If taken between 48 to 72 hours the effectiveness rate drops to 61%.