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Cannabidiol Lacks Direct Effect on Cortical Excitability: A Randomized, Double Blind, Placebo Controlled, 3-Way
Andriy A Gorbenko1,2, Catherine M K E de Cuba1,2, Annika A de Goede1
1Centre for Human Drug Research, Leiden, The Netherlands.
Clinical Pharmacology and Therapeutics
|August 21, 2025
Summary
Cannabidiol (CBD) may not have intrinsic anti-epileptic or sedative effects. Its therapeutic benefits might stem from interactions with other anti-seizure medications like clobazam, rather than direct action.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Cannabidiol (CBD) is an approved adjunctive treatment for specific seizure disorders.
- Its clinical effects are potentially influenced by interactions with co-administered anti-seizure medications (ASMs), such as clobazam.
Purpose of the Study:
- To investigate the intrinsic anti-epileptic and sedative properties of Cannabidiol (CBD).
- To differentiate direct effects of CBD from pharmacokinetic interactions.
Main Methods:
- A randomized, double-blind, placebo-controlled, 3-way crossover trial involving 25 healthy males.
- Administration of single oral doses: 30mg CBD, 700mg CBD, or placebo.
- Assessment of cortical excitability via TMS-EMG/EEG and sedative properties using a CNS test battery.
Main Results:
- CBD showed no significant impact on TMS-EMG parameters compared to placebo.
- Some effects on paired pulse TMS-EEG were observed at specific time points for both 30mg and 700mg CBD doses.
- No significant sedative effects of CBD were detected.
Conclusions:
- Cannabidiol (CBD) may lack inherent anti-epileptic and sedative properties.
- The observed therapeutic and adverse effects of CBD might be predominantly due to drug interactions, particularly with clobazam.
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