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.
In veterinary medicine, guaifenesin is used to induce muscle relaxation and restraint as an adjunct to anesthesia for short procedures (30 - 60 minutes) in large and small animal species. There are combination oral products containing guaifenesin for treating respiratory conditions in horses.
In human medicine, guaifenesin has long been touted as an oral expectorant, but definitive proof of its efficacy is lacking.
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