Compare to Maximum Strength Mucinex DM active ingredients. Say goodbye to mucus with Amazon Basic Care Guaifenesin and Dextromethorphan Hydrobromide Extended-Release Tablets, 1200 mg/60 mg. This cough suppressant and expectorant helps loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive. These extended-release tablets also provide 12-hour relief of cough due to minor throat and bronchial irritation as may occur with the common cold or inhaled irritants. Mucus Relief DM Max relieves the intensity of coughing and the impulse to cough to help you get to sleep. For adults and children 12 years and older. This product does not contain gluten.