A Systematic Review of the Prevalence of Substance Abuse in the South Pacific Region

Background: This review examines the prevalence of substance abuse and related disorders in South Pacific nations. Methods: The review focused on data included in reports published since 2000 from countries like Samoa, Papua New Guinea, Fiji, and French Polynesia, excluding Hawaii, New Zealand, Australia, and American Samoa. Prevalence studies indexed in Medline, CINAHL, PsycInfo, Embase, and Cochrane were screened and retrieved. Joanna Briggs Institute critical appraisal tools were used to assess included studies. Results: Ten studies with diverse methods, such as national surveys, were analysed. Results show high variability in prevalence across countries, sexes, and ethnicities. Notably, tobacco and betel nut use are prevalent. Indigenous populations and men face higher SUD burdens. Discussion: inconsistencies in study methods and reliance on self-reporting limit direct comparison. Data on co-occurring disorders and polysubstance use are limited, highlighting research gaps. The review emphasises the need for culturally sensitive, standardised research to monitor emerging trends like synthetic drug use. Policy suggestions call for targeted interventions and improved surveillance to reduce disparities and support vulnerable populations in Pacific Island communities.