Definition of guaifenesin in US English:



  • An expectorant used in cough syrups and sometimes for pain relief from fibromyalgia.

    • ‘The Food and Drug Administration stressed that the expectorant, extended-release guaifenesin, is not dangerous.’
    • ‘For productive coughs, Jones suggests cough syrup with guaifenesin, which loosens the mucus so you can cough it up.’
    • ‘One trial of the expectorant guaifenesin reported a significant benefit over placebo, but a second trial found no differences between the treated and placebo groups.’
    • ‘Despite its broad use in the treatment of cough, multiple studies have found inconsistent results supporting the effectiveness of guaifenesin as an expectorant or cough suppressant.’
    • ‘I am speaking of certain drugs (for example, guaifenesin, an expectorant used for coughs and colds) that came into wide use decades ago - even before the establishment of the Food and Drug Administration.’