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.
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