The U.S. Food and Drug Administration sent a warning letter to Procter & Gamble notifying the company that its Vicks DayQuil Plus Vitamin C and Vicks Nyquil Plus Vitamin C are illegally marketed combinations of drug ingredients and a dietary ingredient. Both of the over-the-counter (OTC) medicines, which contain vitamin C in addition to several drug ingredients, are marketed as treatments for cold and flu symptoms.
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