Mucinex Fast-Max DM, Max Strength, Cough Relief Liquid, 6 fl oz. Sale! from 1529 1835 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Cough Suppressant and expectorant to help loosen phlegm and mucus Thins & loosens mucus with active ingredient guaifenesin expectorant Controls Cough with active ingredient dextromethorphan HBr cough suppressant Liquid fast acting 4 hour dosing Cough and chest congestion relieving medicine Qty available:100 Tweet