DXM is a synthetic narcotic found in cold and cough medications. If taken in large dosages, this medication can cause hallucinations and out-of-body e DXM is a synthetic narcotic found in cold and cough medications. If taken in large dosages, this medication can cause hallucinations and out-of-body experiences similar to PCP. Addiction treatment in Florida is available to teens and adults with DXM problem. more >> <<less