Here’s a comparison of these drugs to help you make your decision. The active ingredient in Robitussin and Mucinex DM products, dextromethorphan, is an antitussive, or cough suppressant.

Robitussin DM contains two active ingredients: dextromethorphan and guaifenesin. Dextromethorphan is an antitussive drug used to help relieve constant coughing. It helps stop your cough by ...

Robitussin products are commonly used to treat cough and chest congestion. The main active ingredients in most products are guaifenesin and dextromethorphan Guaifenesin is an expectorant that ...

but it did result in some pharmacies pulling certain decongestants in which phenylephrine is the only active ingredient, and overall confusion among consumers. (Robitussin Honey CF Max doesn't ...