Be careful: Nyquil and Mucinex (guaifenesin) are name brands for a "brand" of medication, and many of them have similar ingredients ie: Mucinex (guaifenesin) may have guaifenisen, dextromethorhan, pseudoephedrine, etc. The other nyquil product may have the exact same or similar medications leading to a possible overdose. Best to check with your doctor or a pharmacist prior toopping a bunch of pills.
Answered 2/27/2016
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