Mixed drug toxicity (methadone, oxycodone, desmethylvenlafaxine, quetiapine, olanzapine and benzodiazepines)
AI-generated summary
Liana Pickup, a 32-year-old woman with complex mental illness (bipolar disorder, borderline personality disorder, schizoaffective disorder), chronic back pain, and substance dependence, died from mixed drug toxicity after commencing methadone maintenance therapy. She received her first 20mg methadone dose at 4:55pm on 13 February 2018 and her second dose at 11am the following morning—only 18 hours later. She reported feeling 'woozy' after the second dose, went to bed complaining of abdominal pain, and was found unresponsive shortly after. Clinical lessons include: methadone commencement is a high-risk period requiring daily clinical review during the first week; the respiratory depressant effects of methadone can persist 48 hours; concurrent CNS depressants significantly increase toxicity risk; and partner/family overdose awareness training and naloxone availability could potentially prevent deaths. The coroner noted confounding factors including Liana's history of stockpiling medications, unsanctioned drug use, and methamphetamine use, making it impossible to definitively attribute her death solely to methadone prescribing practices.
AI-generated summary and tagging — may contain inaccuracies; refer to original finding for legal purposes.
Concurrent use of methadone with multiple CNS depressants (clonazepam, desvenlafaxine, olanzapine, quetiapine, oxazepam, buprenorphine patch)
Short dispensing interval of only 18 hours between first and second methadone doses despite methadone's 30-hour half-life and 48-hour respiratory depressant duration
Stockpiling and irregular use of prescribed medications
Undisclosed use of methamphetamine and cannabis
Lack of recognized overdose signs by witness (partner) despite sedation and complaints of feeling 'woozy'
History of unsanctioned dose escalation and obtaining medications from multiple sources
Complex comorbid mental illness with poor engagement in psychological treatment
Coroner's recommendations
That the Department of Health and Human Services consult with the Victorian branch of the Royal Australian College of General Practitioners, the Drug and Alcohol Clinical Advisory Service, and other appropriate expert bodies, regarding how a program could be designed and implemented to facilitate overdose awareness and naloxone administration education being delivered to the partners and family members of people being prescribed strong opioids, and particularly people engaged in opioid replacement therapy.
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