Contaminated synthetic cannabinoids caused a coagulopathy outbreak in Illinois, affecting 174 people and killing 5 | Research

The takeaway

In 2018, synthetic cannabinoids contaminated with rodenticide anticoagulants caused a public health crisis in Illinois, hospitalized 174 people with potentially lethal coagulopathy, and killed five.

Emergency medicine providers, public health officials, harm reduction workers, toxicologists

174 patients hospitalized, 5 died from rodenticide-contaminated synthetic cannabinoids

What the researchers found

The outbreak affected 174 reported patients and caused 5 deaths. The coagulopathy was caused not by synthetic cannabinoids themselves but by contamination with brodifacoum, bromadiol, and difenacoum, potent vitamin K antagonists used as rodenticides. This was the first reported instance of long-acting anticoagulant rodenticide poisoning on this widespread scale.

Why it matters

This outbreak demonstrated that the unregulated synthetic cannabinoid supply chain can introduce lethal contaminants, creating public health emergencies that overwhelm normal clinical and surveillance systems.

The numbers in context

174 reported patients; 5 deaths; contaminants identified: brodifacoum, bromadiol, difenacoum (all vitamin K antagonist rodenticides); first widespread LAAR poisoning event

How the study worked

Public health crisis report documenting the 2018 Illinois outbreak of coagulopathy linked to contaminated synthetic cannabinoids. Chronicles the public health response, clinical management challenges, and lessons learned.

What this study cannot tell us

Public health surveillance likely underestimated the true number of affected individuals. Limited information on how contamination entered the supply chain. Single geographic outbreak may not represent ongoing risk levels.

How to read the evidence

Documented public health crisis with confirmed laboratory findings, though surveillance data may undercount affected individuals.

When this study was published

Published in 2021 documenting the 2018 Illinois outbreak.

The bigger picture

The contamination crisis illustrates the dangers of unregulated drug markets. Unlike quality-controlled pharmaceutical or even regulated cannabis products, synthetic cannabinoids from informal sources can contain any adulterant, with potentially fatal consequences.

Questions still open

Was the contamination intentional or accidental? Have similar contamination events occurred in other regions without detection? What surveillance systems could detect such adulterants earlier?

Common questions

What caused the poisoning?

The synthetic cannabinoid products were contaminated with brodifacoum, bromadiol, and difenacoum. These are potent vitamin K antagonists used in rat poison. They cause severe, potentially fatal bleeding by preventing blood from clotting.

Were the synthetic cannabinoids themselves dangerous?

While synthetic cannabinoids carry their own health risks, the lethal coagulopathy in this outbreak was caused by the contaminants, not the cannabinoid compounds. This highlights the unique danger of unregulated drug supply chains.

Read the original research

Lethal coagulopathy resulting from the consumption of contaminated synthetic cannabinoids: the story of a public health crisis.

Journal of public health (Oxford, England), 43(1), e1-e6

View on PubMed ↗Publisher’s paper ↗

Citation

Fasih, Anum. (2021). Lethal coagulopathy resulting from the consumption of contaminated synthetic cannabinoids: the story of a public health crisis.. Journal of public health (Oxford, England), 43(1), e1-e6. https://doi.org/10.1093/pubmed/fdz067