Webwhat is the difference between mucinex dm and just mucinex®? Mucinex dm and mucinex (without the dm) both contain guaifenesin, an expectorant that thins your mucus. Webdec 6, 2023 · mucinex d and mucinex dm both contain the expectorant guaifenesin (which is contained as a single ingredient in mucinex). Guaifenesin is an expectorant that helps. It has two active ingredients: Pseudoephedrine (gwye fen e sin; Soo doe e fed rin) is a decongestant, expectorant combination. It is used to provide. Mucinex dm what's the difference?
