http://articles.mercola.com/sites/articles/archive/2006/07/27/codeine-no-better-than-a-placebo.aspxCodeine, which is a common ingredient in cough medicines, proved to be barely more effective than a placebo when used in the treatment of coughing resulting from chronic lung disease . Researchers triggered coughing in test subjects with chronic obstructiveenCommunityServer 2008.5 SP1 (Build: 31106.3070)