Find powerful relief from cough and chest congestion with DG Health Maximum Strength Mucus-DM Extended-Release Tablets. Formulated with 1200 mg of guaifenesin, an expectorant that helps thin and loosen mucus, and 60 mg of dextromethorphan HBr, a cough suppressant that helps control coughing, this maximum-strength formula provides up to 12 hours of symptom relief. These extended-release tablets help make coughs more productive while easing chest congestion, so you can breathe more comfortably throughout the day. Comparable to the active ingredients in Maximum Strength Mucinex® DM.