"While it is generally assumed that polydrug use is a hard-to-treat condition, results from large treatment outcome studies in Europe show significant reductions in multiple drug use among highly problematic users. Nevertheless, managing the care of problem polydrug users requires long-term treatment planning with attention to individual needs and multidisciplinary teams working together with flexible and sometimes innovative treatment options."


European Monitoring Centre for Drugs and Drug Addiction, "Polydrug Use: Patterns and Responses" (Lisboa, Portugal: 2009), p. 26.