Say goodbye to mucus and calm your cough with Maximum Strength Mucus-DM from Kirkland Signature. Compare to the active ingredients of Maximum Strength Mucinex DM. These extended-release 12 hour tablets combine the expectorant guaifenesin with the cough suppressant dextromethorphan hydrobromide to give you long-lasting maximum strength cough and mucus relief. For adults and children 12 years and older. Gluten free. Product Attributes: