• Erica Amari, Jürgen Rehm, Elliot Goldner, and Benedikt Fischer.
• Centre for Applied Research in Mental Health and Addiction, Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia.
• Can J Psychiatry. 2011 Aug 1;56(8):495-502.

ObjectiveIn North America, the prevalence of nonmedical prescription opioid use (NMPOU), and morbidity and mortality related to prescription opioid analgesics (POAs) has risen sharply. Epidemiologic studies have suggested a high prevalence of mental health and pain comorbidities in NMPOU samples. Given the potential importance for interventions, a narrative review was conducted on studies reporting data on the co-occurrence of NMPOU with mental health problems and pain symptoms in general, treatment, or special populations.MethodA search of MEDLINE, PubMed, PsycINFO, and Web of Science using defined search terms yielded 74 studies on NMPOU and mental health and (or) pain. Thirty-nine studies published between 1997 and 2009 were included in the review-based on the data they provided on NMPOU and mental health and pain comorbidities.ResultsOur review found strong associations between NMPOU and the comorbidities of interest. Associations between NMPOU and mental health were strongest for depression (OR range 1.2 to 4.3) followed by anxiety disorders (OR range 1.2 to 3.0) in general and treatment populations. The prevalence of pain ranged from 14.5% to 61.5% in general, treatment, and street drug user samples reporting NMPOU.ConclusionsThe extensive associations observed between NMPOU and mental health and pain comorbidities suggest that effective preventive or treatment interventions for NMPOU must consider and attend to these comorbidities. As POAs are widely available and used in North America, POAs may increasingly be used in nonmedical ways for pain or mental health problems not effectively diagnosed or treated.

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