What is Mucinex DM? Dextromethorphan is a cough suppressant. Guaifenesin is an expectorant. Mucinex DM is a combination medicine used to treat cough and chest congestion caused by the common cold or allergies. Dextromethorphan will not treat a cough that is caused by smoking. Adult DM Maximum, Chest Congestion Relief DM, Children's Cough & Chest Congestion DM, Children's Daytime/Nighttime DM, Children's Delsym Cough + Chest Congestion DM, Children's Delsym Cough+ Day/Night, Children's Giltuss Cough & Chest Congestion, Children's Mucinex Cough, Children's Mucinex Cough & Mucus, Children's Mucus Relief Cough, Coricidin Mucinex and Mucinex DM both contain an expectorant that helps loosen mucus. Mucinex DM Generic Name (S): dextromethorphan-guaifenesin Uses This combination medication is used to relieve coughs caused by the common cold, bronchitis, and other breathing illnesses. Guaifenesin belongs Official answer by Drugs.com Mucinex D is (guaifenesin and pseudoephedrine) is an expectorant/nasal decongestant combination, and Mucinex DM (guaifenesin and dextromethorphan) is an expectorant/cough suppressant combination. Mucinex D and Mucinex DM both contain the expectorant guaifenesin (which is contained as a single ingredient in Mucinex ). t7xJpA. Generic Name (S): dextromethorphan-guaifenesin Uses This combination medication is used to relieve coughs caused by the common cold, bronchitis, and other breathing illnesses. Guaifenesin belongs Adult DM Maximum, Chest Congestion Relief DM, Children's Cough & Chest Congestion DM, Children's Daytime/Nighttime DM, Children's Delsym Cough + Chest Congestion DM, Children's Delsym Cough+ Day/Night, Children's Giltuss Cough & Chest Congestion, Children's Mucinex Cough, Children's Mucinex Cough & Mucus, Children's Mucus Relief Cough, Coricidin Fact Checked Mucinex DM is an over-the-counter (OTC) combination medication that relieves cough and chest congestion caused by the common cold, flu, and allergies. Each tablet combines dextromethorphan hydrobromide, a cough suppressant, with guaifenesin, a drug that loosens mucus and bronchial secretions in the lungs.

what does the dm stand for in mucinex dm