Dextromethorphan

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Dextromethorphan is an active ingredient in cough syrups. A US study found that a cough syrup containing Dextromethorphan was no more effective in treating coughs than a placebo[1].

Notes

  1. BBC News, Cough medicines 'have no benefit', BBC News, 6-July-2004, Accessed 28-January-2010