hypoxic brain injury caused by cardiac arrest due to unintentional drug poisoning from a dangerous combination of central nervous system depressant substances
AI-generated summary
A 43-year-old man with long-standing opioid use disorder and polysubstance dependence died from hypoxic brain injury following cardiac arrest caused by drug poisoning. He had been prescribed large quantities of pregabalin, temazepam, and tramadol by his GP despite documented drug-seeking behaviour and illicit substance use. While hospitalised for injection drug complications, he received unnecessary duplicate prescriptions on 3 April 2023, which he filled at different pharmacies. He then injected his partner's methadone in combination with these prescribed medications and other drugs, causing fatal cardiorespiratory depression. The coroner found the prescribing pattern inappropriate and a significant contributory factor. Key clinical lessons include: conduct rigorous risk assessments in opioid use disorder; implement staged supply protocols; avoid duplicate prescriptions; verify patient hospitalisation status; and use real-time prescription monitoring systems to prevent multi-pharmacy dispensing.
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Specialties
general practiceemergency medicinetoxicologycardiology
opioid use disorderdrug dependencyintravenous drug use complicationschronic paindepressionalcohol use disorderdrug poisoningcardiac arresthypoxic brain injury
Contributing factors
inappropriate prescribing of high-risk medications by general practitioner
excessive quantities of pregabalin and temazepam dispensed on consecutive days at different pharmacies
unnecessary duplicate prescriptions issued on 3 April 2023 while patient was hospitalised
patient's known history of opioid use disorder and drug-seeking behaviour not adequately managed
lack of risk mitigation strategies including staged supply or urine drug screening
patient's injection of partner's methadone in combination with prescribed medications
absence of awareness by prescriber that patient was hospitalised at time of consultation
Coroner's recommendations
General practitioners and pharmacies should take all appropriate risk mitigation strategies when prescribing high-risk medications to patients with drug dependency or known medication misuse
Conduct frequent risk assessments for patients with opioid use disorder including unannounced urine drug screens and checking for signs of injecting drug use
Undertake and document risk-benefit assessments to ensure judicious use of high-risk substances in opioid use disorder
Consider staged supply of medication as a clinical management tool for high-risk patients, involving structured pharmacist service with instalment supply
Verify patient hospitalisation status before prescribing, particularly for patients with substance use disorders
Implement real-time prescription monitoring systems such as TasScript to prevent dispensing of duplicate prescriptions at different pharmacies
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