Coroner's Finding: Porteous, Shayne Edward
Deceased
Shayne Edward Porteous
Demographics
59y, male
Date of death
2016-09-25
Finding date
2019-04-24
Cause of death
mixed drug toxicity (tramadol and sertraline), likely serotonin syndrome
AI-generated summary
A 59-year-old man died from mixed drug toxicity involving tramadol and sertraline, likely precipitating serotonin syndrome. He was prescribed tramadol 150mg morning and 100mg evening (total 250mg daily), but evidence indicates he consumed double this dose (approximately 500mg daily), exceeding safe guidelines. When his sertraline was increased from 100mg to 150mg for emotional instability—symptoms potentially representing early serotonin toxicity—the combined high-dose serotonergic agents created a life-threatening interaction. The pharmacy dispensed medications at a rate consistent with double-dosing but failed to question this pattern, monitor for drug interactions, or communicate with the prescriber. Key clinical lessons include: recognizing serotonin syndrome symptoms (emotional instability, irritability, agitation, autonomic dysfunction); vigilant monitoring when combining tramadol with SSRIs; pharmacist responsibility to detect inappropriate dosing patterns and counsel patients on complex medication changes; and interdisciplinary communication between prescribers and dispensers to prevent tragic drug interactions.
AI-generated summary and tagging — may contain inaccuracies; refer to original finding for legal purposes.
Error types
Drugs involved
Contributing factors
- excessive tramadol consumption (approximately 500mg daily, exceeding maximum safe dose of 400mg)
- concurrent high-dose tramadol and sertraline use without adequate monitoring for serotonin toxicity
- increase in sertraline dose from 100mg to 150mg while on high-dose tramadol
- confusion regarding tramadol dosing instructions following prescription change
- inadequate pharmacy dispensing vigilance and failure to question early refill pattern
- lack of clinical documentation and counselling by pharmacist regarding dosing changes
- failure of pharmacy to monitor for drug interactions or communicate with prescriber
- misattribution of serotonin toxicity symptoms to testosterone deficiency by general practitioner
Coroner's recommendations
- Highlight that concurrent use of tramadol and selective serotonin reuptake inhibitors (SSRIs) may produce serotonin syndrome and should be used in combination with extreme caution
- Ensure patients on tramadol and SSRI combinations are monitored for signs of drug toxicity
- Pharmacists dispensing such drug combinations should be alert to the possibility of toxicity and be vigilant in protecting patients from harms associated with these medicines in accordance with professional guidelines
- Medical practitioners and pharmacists responsible for supplying and dispensing prescription medicines should ensure clear communication, documentation and counselling, particularly in the context of medication regimen changes
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