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This paper aimed to determine whether non-fatal opioid overdose and suicide attempts are distinct behaviours by examining the histories of 1500 opioid-dependent individuals. This paper utilised data collected as part of a large retrospective case-control study. Unintentional non-fatal opioid overdoses were more common than suicide attempts (58% vs. 32%). Overall, the correlates associated with a history of attempted suicide only and non-fatal opioid overdose only were different. Drug-related risk behaviours (including high impulsivity, injection of opioids, sedative dependence) were associated with non-fatal opioid overdose; and a history of mental disorders (depression, anxiety disorder, and screening positive for borderline personality disorder (BPD+) were associated with suicide attempts. Additionally, those who reported a history of both behaviours had a more severe clinical profile including excessive drug use, psychological disorders and childhood trauma. The study concluded that non-fatal opioid overdose and attempted suicide are distinct clinically significant problems that require different approaches for prevention. Additionally, if both behaviours are reported a thorough assessment of underlying comorbid problems should be initiated by treatment services.

In a 5-year-follow-up study of 350 opiate addicts in contact with a drug help system in Hamburg, 272 clients (78%) were interviewed a second time after 1 year. The objective of the study was to examine the correlation between mental disorders and drug consumption and its relationship to clients' general life situation. In the majority of the opiate addicts, a pattern of polydrug consumption was observed, but the amount of drugs consumed was clearly lower after 1 year. In the initial survey, a mental disorder according to ICD-10 could be diagnosed for 55% of the sample. Among groups formed by the severity and course of mental disorders or their symptoms, a significant correlation was observed, particularly at the time of follow-up, between the extent of drug consumption and the course of the mental disorder. Other areas, like physical health or social problems/conflicts, were also related to comorbidity (i.e., heavy drug consumption and/or mental disorder). These interrelationships should be taken into account in treatment, care and guidance to increase the prospects for successful treatment.