An evidence-based practice (EBP) is a treatment practice that has been shown to have positive consumer outcomes through controlled research studies across a variety of treatment sites. When someone has two simultaneous disorders such as substance abuse and mental illness, the integration of treatments for both disorders has consistently been shown to have better treatment outcomes than traditional treatment. Specifically, this integration refers to the concurrent treatment of both conditions by the same clinicians trained in both disorders. While developed primarily for co-occurring mental illness and substance abuse problems, service integration is generally considered the preferred strategy when faced with other co-occurring disorders (e.g., mental illness and development disability). In general, evidence leans toward the integration of all services regardless of the presence of an additional disorder (e.g., simultaneously providing psychiatric treatment and supported employment).
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