Psychological Distress, Non-Medical Use of Prescription Medications, and Perceived Unmet Mental Health Care Needs: a Cross-Sectional Study of Ontario Students.

The non-medical use of prescription medications among adolescents has become a concerning public health issue. This study assessed the prevalence of the non-medical use of prescription medications in Ontario high school students, and explored the moderating effect of this use on the relationship between psychological distress and unmet mental health needs. Cross-sectional data for 4896 students, age 14–18, were drawn from the 2019 Ontario Student Drug Use and Health Survey. Psychological distress was measured using the Kessler-6 Distress Scale, unmet mental health needs were defined by self-report (yes/no), and non-prescription medication use was defined by self-reported frequency of use. Using logistic regression, we explored the effect of the non-medical use of prescription medications on the relationship between psychological distress and unmet mental health needs. High proportions of Ontario students reported serious psychological distress (22