Geri-Tussin Guaifenesin Syrup. Guaifenesin is used to treat coughs and congestion caused by the common cold, bronchitis, and other breathing illnesses. Guaifenesin is an expectorant. Alcohol Free. Non-drowsy. For children and adults. Sugar free. Alcohol free. Compares to the active ingredient in Robitussin. Not Made with Natural Rubber Latex. Packaged: 12 Bottles Per Case. Robitussin is a registered trademark of Wyeth Consumer Healthcare. Product Benefits.