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Mucinex DM (guaifenesin / dextromethorphan) is a combination of two medications.
Guaifenesin is an expectorant. It loosens mucus in your airways by making it thinner. This makes it easier to cough out mucus and help clear chest congestion.
Dextromethorphan is an antitussive medication, which is another name for a cough suppressant. It works on the part of your brain that makes you cough (your cough reflex). Its actions on the brain make you cough less.
