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Analgesic Effect of Cannabinoids for Fibromyalgia: A Systematic Review and Meta-Analysis
Pui Ming Lam1, Fengfeng Wang1,2, Chung Hin Shing1
1Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, China.
Pain Physician
|April 21, 2026
Summary
Cannabinoids show promise in reducing fibromyalgia pain and improving quality of life. However, evidence quality and study heterogeneity necessitate cautious interpretation of these analgesic benefits.
Area of Science:
- Pain Medicine
- Pharmacology
- Systematic Reviews
Background:
- Fibromyalgia is a complex chronic pain condition with often inadequate treatment outcomes.
- Cannabinoids are being explored as a potential alternative therapy for fibromyalgia management.
Purpose of the Study:
- To systematically review and meta-analyze the analgesic efficacy of cannabinoids in fibromyalgia patients.
- To assess the impact of cannabinoids on pain intensity, sleep, anxiety, depression, and quality of life.
Main Methods:
- A systematic review and meta-analysis of randomized controlled trials and observational studies.
- Searches conducted across major databases including PubMed, EMBASE, and Cochrane Library.
- Pain intensity measured using standardized mean difference (SMD); evidence quality assessed by GRADE.
Main Results:
- Twelve studies (1,248 patients) indicated significant pain reduction with cannabinoids (SMD = -1.41).
- Improvements observed in sleep quality, anxiety, depression, and quality of life (P < 0.05).
- Common side effects included dizziness and drowsiness; serious adverse events were rare.
Conclusions:
- Cannabinoids may offer analgesic benefits and improve overall well-being in fibromyalgia patients.
- Findings should be interpreted cautiously due to significant heterogeneity and limited high-quality randomized controlled trial data.
- Further research is warranted to confirm efficacy and safety profiles.
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