Compare to the active ingredients in Mucinex DM. Amazon Basic Care Mucus DM Guaifenesin and Dextromethorphan Hydrobromide Extended-Release Tablets, 600 mg/30 mg is a cough suppressant and expectorant that helps loosen phlegm (mucus) and make coughs more productive. Reduces chest congestion caused by the common cold or inhaled irritants. Controls wet and dry coughs due to minor throat or bronchial irritation. Thins and loosens mucus for 12 hours and temporarily relieves the intensity of coughing. This product does not contain gluten. For adults and children 12 years and older. Breathe easier with this 12 hour cold medicine. Reduces the impulse to cough to help you get to sleep.