Manage your cold and flu symptoms with Guaifenesin DM SR. This powerful formula combines two active ingredients: Guaifenesin, an expectorant that helps loosen and thin mucus in the chest to make coughs more productive, and Dextromethorphan HBr, a cough suppressant that acts on the brain to quiet the urge to cough. The Sustained Release (SR) technology provides steady relief over several hours, reducing the frequency of dosing. It is specifically formulated to help clear chest congestion while controlling the dry, hacking cough that often irritates the throat, allowing for better breathing and more restful sleep.