An expectorant used in cough syrups and sometimes for pain relief from fibromyalgia.
- 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.
- 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.
- The Food and Drug Administration stressed that the expectorant, extended-release guaifenesin, is not dangerous.
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