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Updated: Mar 31, 2026

Administration of Δ9-Tetrahydrocannabinol (THC) in Adolescent and Adult Mice
Published on: August 1, 2025
[Two patients with CC9 intoxication: unexpected symptoms of a novel synthetic cannabinoid]
Denne A Scharink1,2, Hugo C Hoogeveen3, Daan Vlot1
1Albert Schweitzer ziekenhuis, afd. Spoedeisende Hulp, Dordrecht.
Background:
Hexahydrocannabinol-C9 (CC9) is a novel synthetic cannabinoid with largely unknown toxicity and clinical effects.
Case Description:
We report two patients with CC9 intoxication presenting with atypical and prolonged symptoms, including profound somnolence, bradycardia, neuropsychiatric disturbances, and impaired mobility. Both patients experienced a protracted course lasting up to 90 hours.
Management:
Treatment was primarily focused on symptom control in a low-stimulus environment. Close monitoring of respiratory function was essential in cases of profound sedation, while benzodiazepines were administered when severe agitation occurred. Activated charcoal combined with a laxative was used in one case and may have contributed to recovery by reducing intestinal reabsorption.
Conclusion:
Clinicians should be alert to the atypical and prolonged course of intoxications caused by new synthetic cannabinoids such as CC9. Early recognition, multidisciplinary consultation, and supportive treatment in a low-stimulus environment are essential.
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