Webdec 6, 2023 · mucinex d and mucinex dm both contain the expectorant guaifenesin (which is contained as a single ingredient in mucinex). It has two active ingredients: Mucinex d and mucinex dm both contain guaifenesin as an active ingredient.

So, they’re both expectorants, or. Guaifenesin is an expectorant that helps. Webwhat is the difference between mucinex d and dm? It has two active ingredients: