DSM-III

This category should be used when the individual is dependent on both an opioid and a nonopioid nonalcoholic substance. An example might be dependence on both heroin and barbiturates. This category should be used only when the specific substances cannot be identified or when the dependence involves so many substances that the clinician prefers to indicate a combination of substances rather than list each specific substance.

DSM-IV

See Polysubstance Dependence

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