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Are there clinical trials supporting cannabis use for rheumatoid arthritis? 

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Updated
ByMy Patient Advice
Author: Dr. Clarissa Morton, PharmD

Interest in clinical trials of cannabis for rheumatoid arthritis has grown, but robust evidence remains limited. A recent scoping review of cannabinoids in rheumatoid arthritis highlighted only one small randomised controlled trial using nabiximols (a THC+CBD spray), which showed a slight reduction in disease activity but mixed results for pain relief.  

While preclinical and medical cannabis studies often show anti-inflammatory effects in lab and animal models, patient trials are very few. The single RCT involved 58 UK patients using nabiximols over a week and suggested small improvements in disease activity, with evidence of low certainty for modest pain reduction and a risk of mild nervous system side effects. 

Medical Cannabis: Alternative to pain relief?

What the Evidence Tells Us 

Arthritis pain relief studies vary in design and outcome. Some reviews note minor reductions in disease activity, but improvements in pain and quality of life are inconsistent. Additional studies, such as observational cohorts and patient surveys, indicate that many people report symptom relief and reduced dependence on conventional painkillers following the use of medical cannabis. However, these are not regulated clinical trials, so evidence of certainty is low. 

CBD arthritis effectiveness remains under investigation. A 2022 registry-based study reported 83% of participants saw pain reduction, and 66% noted better physical function with CBD use, though these were self-reported outcomes without clinical controls. Meanwhile, mixed findings and small sample sizes limit the strength of the conclusions. 

In short, while medical cannabis studies show promise, particularly for rheumatoid arthritis pain, current trial data are limited and mixed. High-quality, large-scale RCTs remain rare, and clinical guidance remains cautious.  

For tailored advice, visit providers like LeafEase for personal consultations and guidance based on the latest evidence. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to arthritis and medical cannabis. 

Dr. Clarissa Morton, PharmD
Author

Dr. Clarissa Morton is a licensed pharmacist with a Doctor of Pharmacy degree and experience across hospital, community, and industrial pharmacy. She has worked in emergency, outpatient, and inpatient pharmacy settings, providing patient counseling, dispensing medications, and ensuring regulatory compliance. Alongside her pharmacy expertise, she has worked as a Support Plan & Risk Assessment (SPRA) officer and in medical coding, applying knowledge of medical terminology, EMIS, and SystmOne software to deliver accurate, compliant healthcare documentation. Her skills span medication safety, regulatory standards, healthcare data management, and statistical reporting.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

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