Robitussin Maximum Strength Elderberry Cough + Chest Congestion DM Non Drowsy Liquid is a chest congestion relief and cough medicine made with real elderberries for flavor. This non drowsy cough medicine utilizes the expectorant guaifenesin, as well as the cough suppressant dextromethorphan, to administer maximum-strength cough and chest congestion relief. This cough medicine and expectorant goes down quickly with the great taste of real elderberry, and helps you get on with your day. As soon as you start to feel that tickle of a cough and build-up of mucus, pour yourself 20 mL and let the formula do the rest. Continue taking this non drowsy cough suppressant every four hours while symptoms persist. Do not take more than 6 doses in any 24-hour period. A versatile and effective non drowsy cough medicine, this Robitussin expectorant helps relieve chest congestion. Delivering cough relief for more than 70 years, Robitussin has the product you need to treat your specific cough symptoms for day and night relief.