Centrally acting muscle relaxant with expectorant properties
Guaifenesin is an oral expectorant drug. The expectorant action of guaifenesin is mediated by stimulation of the gastrointestinal tract. It is a common ingredient in prescription and over-the-counter medications used to treat cough due to colds and minor upper respiratory infections.
 Peter V. Dicpinigaitis and Yvonne E. Gayle, Effect of Guaifenesin on Cough Reflex Sensitivity, 2003, vol. 124, 2178-2181
 Leonid Kagan, Eran Lavy and Ammon Hoffmann, Effect of mode of administration on guaifenesin pharmacokinetics and expectorant action in the rat model, Pulmonary Pharmacology & Therapeutics, 2009, vol. 22, 260-265
Used to assist the expectoration of phlegm from the airways in acute respiratory tract infections.