Mixed drug toxicity (venlafaxine, duloxetine, mirtazapine, oxycodone, tapentadol, benzodiazepines)
AI-generated summary
Kim Bartolo, a 47-year-old woman with depression, anxiety, alcohol use disorder and chronic conditions, died from mixed drug toxicity involving multiple prescription medications. She was admitted to Brunswick Private Hospital in October 2021 with a fractured hip and psychiatric review introduced a cross-titration medication regime (replacing venlafaxine with duloxetine, diazepam with oxazepam). Critical clinical lessons: The discharge summary failed to document this cross-titration plan and was not communicated to her GP. At subsequent telehealth appointments, the GP, unaware of the planned medication changes and lacking the discharge summary, prescribed overlapping medications including both old and new antidepressants plus opioids. This resulted in dangerous polypharmacy with venlafaxine and duloxetine at toxic levels. Better communication of discharge summaries documenting medication transitions, especially involving psychiatric treatment, is essential to prevent duplicate prescribing and drug interactions.
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Specialties
psychiatryorthopaedic surgerygeneral practicegeneral medicine
mixed drug toxicityhypertensive heart diseasepersistent depressive disorderanxietyalcohol use disorderchronic obstructive pulmonary diseaseasthmachronic liver diseaseWernicke encephalopathy
Contributing factors
Discharge summary from Brunswick Private Hospital did not document the cross-titration medication plan
Discharge summary was not communicated to the patient's general practitioner
General practitioner was unaware of the medication transition plan
General practitioner prescribed overlapping medications without knowledge of the hospital-initiated regimen
Polypharmacy with multiple central nervous system depressants and opioids
Venlafaxine and duloxetine detected at toxic levels post-mortem
Hypertensive heart disease with cardiac enlargement
History of alcohol and illicit drug use
Coroner's recommendations
Brunswick Private Hospital should review its procedures and processes in relation to the formulation and communication of discharge summaries to ensure that they include all relevant information relating to the treatment of a patient arising from the admission (including medication requirements relating to any mental health treatment) and that they are promptly communicated to the patient's General Practitioner
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