Leader Mucus Relief Extended Release Maximum Strength, 1200 mg Guaifenesin,14 Extended Release Tablets Sale! from 1389 1667 /per Qty. Sold Out This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Maximum Strength Chest Congestion Medicine Thins & loosens mucus with active ingredient guaifenesin expectorant Relieves Chest Congestion Comparable to Mucinex Maximum Strength Qty available:0 Tweet