A narrative review found emerging evidence that CBD may reduce positive, negative, and cognitive symptoms of schizophrenia with fewer side effects than conventional antipsychotics, and could also help with cannabis cravings in this population.
Clinicians, patients, and researchers interested in alternative schizophrenia treatments.
CBD may address all three symptom domains of schizophrenia
What the researchers found
Studies suggest CBD may treat multiple symptom domains of schizophrenia: positive symptoms (hallucinations, delusions), negative symptoms (social withdrawal, flat affect), and cognitive deficits. CBD appears to work through mechanisms distinct from THC, including modulation of anandamide, dopamine, glutamate, and GABA signaling. It may also reduce cannabis cravings and withdrawal in patients who use cannabis.
Why it matters
While THC can worsen psychosis, CBD appears to have antipsychotic properties without the metabolic and movement side effects common with conventional antipsychotics.
The numbers in context
Review covers positive, negative, and cognitive symptom domains. Discusses CBD as both standalone and adjunctive treatment. Examines multiple molecular mechanisms.
How the study worked
Narrative review of clinical and preclinical literature on CBD for schizophrenia, covering efficacy, safety, dosing, delivery methods, and molecular mechanisms.
What this study cannot tell us
Limited number of clinical trials specifically in schizophrenia patients. Optimal dosing and treatment duration remain unclear. Long-term safety data is sparse.
How to read the evidence
Narrative review of limited clinical evidence. Promising but too early for clinical recommendations.
When this study was published
Published in 2022.
The bigger picture
The potential for CBD to treat schizophrenia while also helping patients reduce cannabis use addresses two linked clinical challenges simultaneously.
Questions still open
- What is the optimal CBD dose for schizophrenia? Is CBD more effective as monotherapy or adjunctive treatment? Would CBD reduce cannabis use in patients who self-medicate?
Common questions
How is CBD different from THC for schizophrenia?
Could CBD replace current antipsychotic medications?
Read the original research
Understanding the Potential Benefits of Cannabidiol for Patients With Schizophrenia: A Narrative Review.
Schizophrenia bulletin open, 3(1), sgab053
Citation
Dyck, Garrison J B; Maayah, Zaid H; Eurich, Dean T; Dyck, Jason R B. (2022). Understanding the Potential Benefits of Cannabidiol for Patients With Schizophrenia: A Narrative Review.. Schizophrenia bulletin open, 3(1), sgab053. https://doi.org/10.1093/schizbullopen/sgab053
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