Dextromethorphan Hydrobromide Guaifenesin (Robitussin DM) 15mg/100mg per 5ml Syrup 60ml is a cough syrup designed to relieve both dry and productive coughs. It contains Dextromethorphan, a cough suppressant, and Guaifenesin, an expectorant that helps loosen mucus in the chest. The 60ml bottle provides effective relief for cough and chest congestion.