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Doctors and researchers question the efficacy of many common over-the-counter treatments for colds and flus. Jeff Greenberg/Jeffrey Greenberg/Universal Images hide caption

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Jeff Greenberg/Jeffrey Greenberg/Universal Images

Sudafed and other common nasal decongestants containing pseudoephedrine are on display behind the counter at Hospital Discount Pharmacy in Edmond, Okla., Jan. 11, 2005. AP hide caption

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AP