Guaifenesin is an expectorant that helps. Webboth mucinex d and mucinex dm contain the active ingredient guaifenesin, which is an expectorant that helps loosen and thin mucus in the airways, making it easier to cough. Mucinex d and mucinex dm both contain guaifenesin as an active ingredient.

Webwhat is the difference between mucinex d and dm? Webdec 6, 2023 · mucinex d and mucinex dm both contain the expectorant guaifenesin (which is contained as a single ingredient in mucinex). So, they’re both expectorants, or. It has two active ingredients: