Among nearly 24,000 emergency department presentations for recreational drug toxicity across Europe, synthetic cannabinoids nearly tripled the odds of seizures while natural cannabis was associated with lower seizure risk.
Emergency physicians, synthetic cannabinoid users, and drug policy researchers.
2.9x seizure risk for synthetic cannabinoids vs 0.65x for cannabis
What the researchers found
Of 23,947 ED presentations, 4.2% involved seizures. Synthetic cannabinoids were associated with 2.90 times higher seizure odds (95% CI 2.19-3.84), and fentanyl with 2.63 times (95% CI 1.20-5.80). Natural cannabis was associated with lower seizure incidence (OR 0.65, 95% CI 0.50-0.86). Patients with seizures had significantly higher rates of coma, cardiac arrest, intubation, ICU admission, and death.
Why it matters
Synthetic cannabinoids are often perceived as cannabis alternatives, but this large dataset shows they carry fundamentally different and more dangerous clinical profiles, particularly regarding seizure risk.
The numbers in context
23,947 presentations (2014-2017). 1,013 (4.2%) with seizures. Synthetic cannabinoids: OR 2.90 (95% CI 2.19-3.84). Fentanyl: OR 2.63 (95% CI 1.20-5.80). Cannabis: OR 0.65 (95% CI 0.50-0.86). Heroin: OR 0.46.
How the study worked
Retrospective analysis of the European Drug Emergencies Plus (Euro-DEN Plus) Network database covering ED presentations with acute recreational drug toxicity from January 2014 to December 2017 across multiple European centers.
What this study cannot tell us
Observational data. Seizure occurrence may be underreported. Self-reported drug use may be inaccurate. Polysubstance use common. Cannot establish causation.
How to read the evidence
Large multi-center dataset with clear associations, but observational design and self-reported drug use.
When this study was published
2019 study using 2014-2017 data.
The bigger picture
The protective association of natural cannabis with seizures, contrasted with the elevated risk from synthetic cannabinoids, underscores that these products should not be considered interchangeable.
Questions still open
- Which specific synthetic cannabinoids carry the highest seizure risk? Is the cannabis protective association a direct pharmacological effect or a confounder?
Common questions
Are synthetic cannabinoids more dangerous than natural cannabis?
What happens when people have seizures from drug use?
Read the original research
Seizures as a complication of recreational drug use: Analysis of the Euro-DEN Plus data-set.
Neurotoxicology, 73, 183-187
Citation
Wolfe, Caitlin E; Wood, David M; Dines, Alison; Whatley, Benjamin P; Yates, Christopher; Heyerdahl, Fridtjof; Hovda, Knut Erik; Giraudon, Isabelle; Dargan, Paul I. (2019). Seizures as a complication of recreational drug use: Analysis of the Euro-DEN Plus data-set.. Neurotoxicology, 73, 183-187. https://doi.org/10.1016/j.neuro.2019.04.003
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