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1997: US FDA
declares certain OCs safe and effective for EC
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1998: FDA
approves PREVEN (Yuzpe)
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1998: Large
WHO trial reports favorable safety/efficacy data for
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levonorgestrel EC
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1999: FDA
approves Plan B (levonorgestrel)
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2004: FDA
rejects scientific panel recommendation to change
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Plan B status
over-the-counter
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