Mucinex d and mucinex dm both contain guaifenesin as an active ingredient. Guaifenesin is an expectorant that helps. Mucinex dm what's the difference?

So, they’re both expectorants, or. Webthe main difference between mucinex, mucinex d, and mucinex dm is the active ingredients in each brand name. It has two active ingredients: Webmucinex d and mucinex dm both contain the expectorant guaifenesin (which is contained as a single ingredient in mucinex). Mucinex contains guaifenesin only and is used.

Mucinex contains guaifenesin only and is used.