Tussin Expectorant, 4 oz, QC99911 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Robitussin. Helps loosen phlegm (mucus) and thin bronchial secretions to make coughs more productive. For ages 12 and over. Alcohol-free Non-drowsy Original formula.