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Jennifer A Smith/Getty Images(NEW YORK) -- Over-the-counter agents to treat upper respiratory symptoms like nasal congestion make up a multi-billion-dollar business. But recently, a Food and Drug Administration advisory committee ruled that oral phenylephrine, commonly found in some over-the-counter, or OTC, products like Dayquil, Mucinex, and Sudafed PE, does not work as a decongestant. The decision has left many consumers confused when searching for relief among all the available products on store shelves. "It really is stressful for a lot of consumers," board-certified pulmonary c...

Jennifer A Smith/Getty Images(NEW YORK) -- Over-the-counter agents to treat upper respiratory symptoms like nasal congestion make up a multi-billion-dollar business. But recently, a Food and Drug Administration advisory committee ruled that oral phenylephrine, commonly found in some over-the-counter, or OTC, products like Dayquil, Mucinex, and Sudafed PE, does not work as a decongestant. The decision has left many consumers confused when searching for relief among all the available products on store shelves. "It really is stressful for a lot of consumers," board-certified pulmonary c...