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An advisory group for federal regulators now officially agrees with decades of research suggesting it is ineffective. George Rudy / Shutterstock.com
An ingredient used in over-the-counter decongestant medicines like Benadryl, Nyquil, Sudafed and Mucinex does nothing to help with congestion, according to a Food and Drug Administration advisory committee vote this week. That is true for the dosages currently available on the market, and studying higher doses would “not be safe” due to the ingredient’s effect on blood pressure…