Geri-Tussin DM Syrup. For patients who need maximum strength relief from severe cold symptoms around the clock, Maximum Strength. Helps loosen phlegm (mucus) and thin bronchial secretions to drain bronchial tubes. Temporarily relieves cough due to minor throat and bronchial irritation as may occur with a cold. Alcohol-free. Robitussin is a registered trademark of Wyeth Consumer Healthcare. Product Benefits.