http://articles.mercola.com/sites/articles/archive/2002/12/21/interferon.aspxSome 33 percent of hepatitis C patients in a small study developed depression as a result of taking the drug interferon. Depression had previously been identified as a possible side effect of the drug, which is used to treat adult leukemia, certain cancersenCommunityServer 2008.5 SP1 (Build: 31106.3070)