Examination of the Inventory of Drug Use Consequences with Individuals with Serious and Persistent Mental Illness and Co-Occurring Substance Use Disorders

Background: The Inventory of Drug Use Consequences (InDUC) () is a 50-item measure that evaluates lifetime and recent consequences of substance use. Objectives: This study examined the psychometric properties of a modified version of the Inventory of Drug Use Consequences (InDUC-M) in individuals with serious and persistent mental illness (SPMI) and co-occurring substance use disorders (SUDs). Methods: We examined self-reported consequences in the sample, evaluated internal consistency, identified items for a brief form of the InDUC-M, and explored relationships with indicators of substance use severity. Results: InDUC-M Lifetime and Recent subscales showed good internal consistency and were related to other measures of substance use and problems. A brief version of the InDUC-M Recent (SIP-M) showed excellent internal consistency and was highly correlated with both Lifetime and Recent subscales. Conclusion: The InDUC-M and the SIP-M performed well in individuals with SPMI and SUDs. Conclusion and Scientific Significance: Overall, these findings are a useful first step in determining the utility of the InDUC-M in people with SPMI and SUDs.