Plan B effectiveness depends heavily on timing, with specific side effects and interactions to consider when taken alongside regular birth control pills.
Approximately 50 percent of pregnancies in the United States are unintended, according to a February 2014 report in the American Journal of Public Health. Plan B is one of several methods of emergency contraception to prevent pregnancy after unprotected sex or a birth control failure.
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Emergency contraception -- otherwise known as the morning-after pill -- is a safe and effective method to prevent pregnancy if your birth control method failed or you had unprotected sex. Plan B, a brand of emergency contraception, comes in 2 strengths.
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