Perhaps: The cough suppressant in Mucinex (guaifenesin) dm is dextromethorfan. It is ralatively mild cough suppressant and ofter combined with an anti-histamine. I'm not sure what other cough medicine you want to use. Codeine often works better and is available by prescription. If the cough is persistant you probably should see your physician.
Answered 2/17/2015
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