Inactive Ingredients Anhydrous Citric Acid, FD&C Red No. 40, Glycerin, High Fructose Corn Syrup, Menthol, Natural Flavor, Polyethylene Glycol, Propylene Glycol, Purified Water, Sodium Benzoate, Sodium Citrate, Sucralose. Active Ingredients (in each 10ml) - Purposes. Dextromethorphan HBr, USP 20mg - Cough Suppressant. Guaifenesin, USP 200mg - Expectorant.