Levonorgestrel, one of the main ingredients in emergency contraceptive pills, including Plan B, was found in a recent study to be less effective in overweight and obese women. Justin Sullivan/Getty Images hide caption

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The Plan B One-Step morning-after pill will now be available to women as young as 15 without a prescription, and will have another three years of protection from generic competition. AP hide caption

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Protesters picket in front of the Jacob K. Javits Federal Building in New York City in 2006 for the removal of an age limit on the morning-after pill. Bloomberg/Bloomberg via Getty Images hide caption

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Plan B One-Step might be the only emergency contraceptive available to all ages without a prescription. ASSOCIATED PRESS hide caption

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A federal judge has ordered the Food and Drug Administration to make all levonorgestrel-based emergency contraceptives available to younger teens without a prescription. Scott Olson/Getty Images hide caption

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Plan B is one of two emergency contraceptives available in the U.S. UPI/Landov hide caption

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House Speaker John Boehner, R-Ohio, at the Capitol on Wednesday. Mark Wilson/Getty Images hide caption

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Plan B is available over the counter for people 17 and older. AP hide caption

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