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Abstract Title:

Neural basis of anxiolytic effects of cannabidiol (CBD) in generalized social anxiety disorder: a preliminary report.

Abstract Source:

J Psychopharmacol. 2010 Sep 9. Epub 2010 Sep 9. PMID: 20829306

Abstract Author(s):

José Alexandre S Crippa, Guilherme Nogueira Derenusson, Thiago Borduqui Ferrari, Lauro Wichert-Ana, Fábio L S Duran, Rocio Martin-Santos, Marcus Vinícius Simões, Sagnik Bhattacharyya, Paolo Fusar-Poli, Zerrin Atakan, Alaor Santos Filho, Maria Cecília Freitas-Ferrari, Philip K McGuire, Antonio Waldo Zuardi, Geraldo F Busatto, Jaime Eduardo Cecílio Hallak

Article Affiliation:

Departments of Neurosciences and Behaviour, Division of Psychiatry, University of São Paulo, Brazil and NCT Translational Medicine.

Abstract:

Animal and human studies indicate that cannabidiol (CBD), a major constituent of cannabis, has anxiolytic properties. However, no study to date has investigated the effects of this compound on human pathological anxiety and its underlying brain mechanisms. The aim of the present study was to investigate this in patients with generalized social anxiety disorder (SAD) using functional neuroimaging. Regional cerebral blood flow (rCBF) at rest was measured twice using (99m)Tc-ECD SPECT in 10 treatment-naïve patients with SAD. In the first session, subjects were given an oral dose of CBD (400 mg) or placebo, in a double-blind procedure. In the second session, the same procedure was performed using the drug that had not been administered in the previous session. Within-subject between-condition rCBFcomparisons were performed using statistical parametric mapping. Relative to placebo, CBD was associated with significantly decreased subjective anxiety (p<0.001), reduced ECD uptake in the left parahippocampal gyrus, hippocampus, and inferior temporal gyrus (p<0.001, uncorrected), and increased ECD uptake in the right posterior cingulate gyrus (p<0.001, uncorrected). These results suggest that CBD reduces anxiety in SAD and that this is related to its effects on activity in limbic and paralimbic brain areas.

Study Type : Human Study

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Sayer Ji
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