FDA says some cold and allergy drugs have an ineffective key ingredient
There are new concerns that phenylephrine, an ingredient in common over-the-counter cold and allergy medicines is ineffective. The FDA said the ingredient is safe but many popular medicines are being pulled off the shelves. NBC News’ Dr. Vin Gupta reports on what companies are doing next. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC
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