Cited by 2,169Cannabis and Cannabinoid ResearchNausea and vomiting managementComplementary and Alternative Medicine Studies

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Cannabinoids for Medical Use: A Systematic Review and Meta-analysis

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Abstract

IMPORTANCE: Cannabis and cannabinoid drugs are widely used to treat disease or alleviate symptoms, but their efficacy for specific indications is not clear. OBJECTIVE: To conduct a systematic review of the benefits and adverse events (AEs) of cannabinoids. DATA SOURCES: Twenty-eight databases from inception to April 2015. STUDY SELECTION: Randomized clinical trials of cannabinoids for the following indications: nausea and vomiting due to chemotherapy, appetite stimulation in HIV/AIDS, chronic pain, spasticity due to multiple sclerosis or paraplegia, depression, anxiety disorder, sleep disorder, psychosis, glaucoma, or Tourette syndrome. DATA EXTRACTION AND SYNTHESIS: Study quality was assessed using the Cochrane risk of bias tool. All review stages were conducted independently by 2 reviewers. Where possible, data were pooled using random-effects meta-analysis. MAIN OUTCOMES AND MEASURES: Patient-relevant/disease-specific outcomes, activities of daily living, quality of life, global impression of change, and AEs. RESULTS: A total of 79 trials (6462 participants) were included; 4 were judged at low risk of bias. Most trials showed improvement in symptoms associated with cannabinoids but these associations did not reach statistical significance in all trials. Compared with placebo, cannabinoids were associated with a greater average number of patients showing a complete nausea and vomiting response (47% vs 20%; odds ratio [OR], 3.82 [95% CI, 1.55-9.42]; 3 trials), reduction in pain (37% vs 31%; OR, 1.41 [95% CI, 0.99-2.00]; 8 trials), a greater average reduction in numerical rating scale pain assessment (on a 0-10-point scale; weighted mean difference [WMD], -0.46 [95% CI, -0.80 to -0.11]; 6 trials), and average reduction in the Ashworth spasticity scale (WMD, -0.36 [95% CI, -0.69 to -0.05]; 7 trials). There was an increased risk of short-term AEs with cannabinoids, including serious AEs. Common AEs included dizziness, dry mouth, nausea, fatigue, somnolence, euphoria, vomiting, disorientation, drowsiness, confusion, loss of balance, and hallucination. CONCLUSIONS AND RELEVANCE: There was moderate-quality evidence to support the use of cannabinoids for the treatment of chronic pain and spasticity. There was low-quality evidence suggesting that cannabinoids were associated with improvements in nausea and vomiting due to chemotherapy, weight gain in HIV infection, sleep disorders, and Tourette syndrome. Cannabinoids were associated with an increased risk of short-term AEs.

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Crossref · 10.1001/jama.2015.6358

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Research works printed but not linked: 20

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Metadata

Authors
Whiting, P. F., Wolff, R. F., Deshpande, S., Di Nisio, M., Duffy, S., Hernandez, A. V., Keurentjes, J. C., Lang, S., Misso, K., Ryder, S., Schmidlkofer, S., Westwood, M., & Kleijnen, J.
Affiliations
  • University Hospitals Bristol NHS Foundation Trust (GB)
  • Kleijnen Systematic Reviews (United Kingdom) (GB)
  • Department of Medical, Oral, and Biotechnological Sciences, University “G. D'Annunzio” of Chieti-Pescara, Chieti, Italy5Department of Vascular Medicine, Academic Medical Center, Amsterdam, the Netherlands
  • Medical School, Universidad Peruana de Ciencias Aplicadas (UPC), Lima, Peru7Health Outcomes and Clinical Epidemiology Section, Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
  • Radboud University Medical Center (NL)
  • Institut für Epidemiologie und kongenitale Erkrankungen, Cepicon GmbH, Hamburg, Germany
  • Maastricht University (NL)
Venue
JAMA
Published
2015-06-23
Volume
313
Issue
24
Pages
2456
ISSN
  • 0002-9955 (ISSN-L)
  • 0098-7484
OpenAlex
W2120227293
Cited by
2,169
References
137
Citations by year
2026: 119 · 2025: 166 · 2024: 168 · 2023: 200 · 2022: 220 · 2021: 262 · 2020: 272 · 2019: 230 · 2018: 209 · 2017: 159 · 2016: 131 · 2015: 33
FWCI
22.34
Type
journal article
Language
en
Open access
Locations
  • JAMA (publishedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion, other-oa)
  • Bristol Research (University of Bristol) (publishedVersion)
  • Zenodo (CERN European Organization for Nuclear Research) (submittedVersion, cc-by)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Americanae (AECID Library) (submittedVersion, other-oa)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by)
  • Explore Bristol Research (submittedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology (medical) › Cannabis and Cannabinoid Research
  • Health Sciences › Medicine › Surgery › Nausea and vomiting management
  • Health Sciences › Medicine › Complementary and alternative medicine › Complementary and Alternative Medicine Studies
Keywords
cannabinoids, medical cannabis, nausea and vomiting, chemotherapy-induced nausea, chronic pain, spasticity, multiple sclerosis, depression, anxiety, sleep disorders, psychosis, glaucoma, Tourette syndrome, adverse events, quality of life, activities of daily living, risk of bias, placebo comparison
MeSH terms
Anorexia, Mental Disorders, Cannabinoids, Tourette Syndrome, Glaucoma, Humans, Muscle Spasticity, Nausea, Randomized Controlled Trials as Topic, Chronic Pain, Medical Marijuana

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