Mucinex d and mucinex dm both contain guaifenesin as an active ingredient. So, theyโ€™re both expectorants, or. Webthe main difference between mucinex, mucinex d, and mucinex dm is the active ingredients in each brand name.

Mucinex contains guaifenesin only and is used. Mucinex dm what's the difference? Webwhat is the difference between mucinex d and dm? Guaifenesin is an expectorant that helps. It has two active ingredients:

It has two active ingredients: