Mental Health and Substance Use Co-Occurrence Among Indigenous Peoples: a Scoping Review

This scoping review examined the literature on co-occurring mental health conditions and substance use among Indigenous peoples globally across (i) time, (ii) types of conditions examined, (iii) countries, (iv) research designs, and (v) participants and settings. Medline, Embase, PsycInfo, and Web of Science were searched across all years up until October 2022 for relevant studies. Ninety-four studies were included, with publications demonstrating a slight and gradual increase over time. Depressive disorder and alcohol were the most examined co-occurring conditions. Most studies included Indigenous people from the United States (71%). Ninety-seven percent of the studies used quantitative descriptive designs, and most studies were conducted in Indigenous communities/reservations (35%). This review provides the first comprehensive exploration of research on co-occurring mental health and substance use conditions among Indigenous peoples. The information should be used to guide the development of strategies to improve treatment and prevention.