Matthew Douglas McLachlan - Non-inquest findings

28y · Male·Mixed drug toxicity (synergistic effects of diazepam, oxycodone, and fentanyl causing respiratory depression)

Matthew McLachlan, a 28-year-old paraplegic with chronic pain from spinal cord injury, died from mixed drug toxicity while hospitalized for urinary tract infection treatment. He was receiving fentanyl patches, oxycodone, and diazepam in hospital, but deliberately concealed his inpatient status when visiting his GP on 6 June 2017, obtaining additional diazepam and oxycodone prescriptions. He self-administered these medications alongside hospital medications, achieving toxic levels. Critical lessons: clinicians should routinely ask patients about concurrent care at other facilities; GPs should verify inpatient status before prescribing opioids; hospital staff should maintain higher suspicion of drug-seeking behaviour in patients with acknowledged opioid dependency and previous intravenous drug use; coordinated pain management across settings is essential for opioid-dependent patients; consider home-based IV therapy to reduce unsupervised hospital absences.