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A systematic review of the effect of cannabidiol on cognitive function: Relevance to schizophrenia

Journal Article


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Abstract


  • Background and objectives

    Cognitive impairment is a core symptom domain of schizophrenia, neurological disorders and substance abuse. It is characterised by deficits in learning, memory, attention and executive functioning and can severely impact daily living. Antipsychotic drugs prescribed to treat schizophrenia provide limited cognitive benefits and novel therapeutic targets are required. Cannabidiol (CBD), a component of the cannabis plant, has anti-inflammatory and antipsychotic-like properties; however, its ability to improve cognitive impairment has not been thoroughly explored. The aim of this systematic review was to evaluate preclinical and clinical literature on the effects of CBD in cognitive domains relevant to schizophrenia.

    Methods

    A systematic literature search was performed across numerous electronic databases for English language articles (January 1990–March 2016), with 27 articles (18 preclinical and 9 clinical studies) included in the present review.

    Results

    CBD improves cognition in multiple preclinical models of cognitive impairment, including models of neuropsychiatric (schizophrenia), neurodegenerative (Alzheimer’s disease), neuro-inflammatory (meningitis, sepsis and cerebral malaria) and neurological disorders (hepatic encephalopathy and brain ischemia). To date, there is one clinical investigation into the effects of CBD on cognition in schizophrenia patients, with negative results for the Stroop test. CBD attenuates Δ9-THC-induced cognitive deficits.

    Conclusions

    The efficacy of CBD to improve cognition in schizophrenia cannot be elucidated due to lack of clinical evidence; however, given the ability of CBD to restore cognition in multiple studies of impairment, further investigation into its efficacy in schizophrenia is warranted. Potential mechanisms underlying the efficacy of CBD to improve cognition are discussed.

Publication Date


  • 2017

Citation


  • Osborne, A. L., Solowij, N. & Weston-Green, K. (2017). A systematic review of the effect of cannabidiol on cognitive function: Relevance to schizophrenia. Neuroscience and Biobehavioral Reviews, 72 310-324.

Scopus Eid


  • 2-s2.0-85006507906

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2037&context=ihmri

Ro Metadata Url


  • http://ro.uow.edu.au/ihmri/1012

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 310

End Page


  • 324

Volume


  • 72

Place Of Publication


  • United Kingdom

Abstract


  • Background and objectives

    Cognitive impairment is a core symptom domain of schizophrenia, neurological disorders and substance abuse. It is characterised by deficits in learning, memory, attention and executive functioning and can severely impact daily living. Antipsychotic drugs prescribed to treat schizophrenia provide limited cognitive benefits and novel therapeutic targets are required. Cannabidiol (CBD), a component of the cannabis plant, has anti-inflammatory and antipsychotic-like properties; however, its ability to improve cognitive impairment has not been thoroughly explored. The aim of this systematic review was to evaluate preclinical and clinical literature on the effects of CBD in cognitive domains relevant to schizophrenia.

    Methods

    A systematic literature search was performed across numerous electronic databases for English language articles (January 1990–March 2016), with 27 articles (18 preclinical and 9 clinical studies) included in the present review.

    Results

    CBD improves cognition in multiple preclinical models of cognitive impairment, including models of neuropsychiatric (schizophrenia), neurodegenerative (Alzheimer’s disease), neuro-inflammatory (meningitis, sepsis and cerebral malaria) and neurological disorders (hepatic encephalopathy and brain ischemia). To date, there is one clinical investigation into the effects of CBD on cognition in schizophrenia patients, with negative results for the Stroop test. CBD attenuates Δ9-THC-induced cognitive deficits.

    Conclusions

    The efficacy of CBD to improve cognition in schizophrenia cannot be elucidated due to lack of clinical evidence; however, given the ability of CBD to restore cognition in multiple studies of impairment, further investigation into its efficacy in schizophrenia is warranted. Potential mechanisms underlying the efficacy of CBD to improve cognition are discussed.

Publication Date


  • 2017

Citation


  • Osborne, A. L., Solowij, N. & Weston-Green, K. (2017). A systematic review of the effect of cannabidiol on cognitive function: Relevance to schizophrenia. Neuroscience and Biobehavioral Reviews, 72 310-324.

Scopus Eid


  • 2-s2.0-85006507906

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2037&context=ihmri

Ro Metadata Url


  • http://ro.uow.edu.au/ihmri/1012

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 310

End Page


  • 324

Volume


  • 72

Place Of Publication


  • United Kingdom