Table 1.

Summary of the search criteria

Free-text search	AND/OR	ICD10-AM code (where drug name does not appear in the text field)
[All pharmaceutical opioid drug name including variations (eg, “Tramadol/ tramal/ zydol”, “Morphine/ MS contin/ MS mono/ kapanol/ anamorph/ sevredol”, “Oxycodone/ oxycodeine/ oxy/ oxycontin/ endone/ targin/ oxynorm/ proladone/ novacodone”)] AND [Overdose/poisoning terms included in the text field (eg, ‘overdose’ ‘od’ ‘poisoning’ ‘drug abuse’ ‘toxicity’ ‘poison’ ‘self harm’ ‘suicide') OR ICD10-AM codes for poisoning by narcotics and psychodysleptics’ appear in one of the three VEMD diagnosis codes T40.2, T40.3, T40.4]		The following T40 ‘poisoning by narcotics and psychodysleptics’ codes appear anywhere within the three VEMD diagnosis codes: T40.2—other opioids, for example, codeine or morphine, also hydromorphone, oxycodone, opioid not elsewhere classified (NEC), hydrocodone T40.3—methadone T40.4—other synthetic narcotics, including pethidine, Opiate NEC, buprenorphine, dextropropoxyphene, fentanyl, tramadol

ICD10-AM, International Classification of Diseases 10th Revision, Australian modification; VEMD, Victorian Emergency Minimum Dataset.