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Abstract
Aims. This study examined overdose deaths involving benzodiazepines and prescription opioids, and studied associated factors. Methods. In a retrospective registry study of drug-overdose deaths (n = 167) with post-mortem toxicological findings of benzodiazepines and/or opioids/carisoprodol (strong analgesics) in Oslo, Norway, from 2006 to 2008, prescribing and dispensing patterns were investigated, and factors associated with benzodiazepines and/or strong analgesics in post-mortem toxicology where these medications were not prescribed were identified. Results. Among deceased with toxicological findings of only benzodiazepines, 28.1% (20.7–36.9) had been dispensed benzodiazepines four weeks prior to death; only strong analgesics, 33.3% (13.0–61.3) had been dispensed strong analgesics; both benzodiazepines and strong analgesics, 58.3% (36.9–77.2) had been dispensed benzodiazepines and/or strong analgesics. Also, 33.0% of the deceased had five or more different prescribing physicians of either benzodiazepines or strong analgesics in the year prior to death. Doses of both dispensed benzodiazepines and strong analgesics were higher than recommended. Younger age and residing outside Oslo were associated with having benzodiazepines and/or strong analgesics in the toxicological findings when these medications had not been dispensed (p = 0.006 and p = 0.039, respectively). Conclusion. The majority of benzodiazepines and strong analgesics detected in overdose deaths were non-prescribed and/or associated with less than optimal prescribing practices by some treating physicians.
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Declaration of interest
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.