Mixed findings regarding quality of evidence supporting benefit of medical marijuana
In an analysis of the findings of nearly 80 randomized trials that included about 6,500 participants, there was moderate-quality evidence to support the use of cannabinoids (chemical compounds that are the active principles in cannabis or marijuana) for the treatment of chronic pain and lower-quality evidence suggesting that cannabinoids were associated with improvements in nausea and vomiting due to chemotherapy, sleep disorders, and Tourette syndrome, according to a study in the June 23/30 issue of JAMA.
Medical cannabis refers to the use of cannabis or cannabinoids as medical therapy to treat disease or alleviate symptoms. In the United States, 23 states and Washington, D.C., have introduced laws to permit the medical use of cannabis; many other countries have similar laws. Despite the wide us of cannabis and cannabinoid drugs for medical purposes, their efficacy for specific indications is not clear, according to background information in the article.
Penny F. Whiting, Ph.D., of the University of Bristol, Bristol, United Kingdom, and colleagues evaluated the evidence for the benefits and adverse events (AEs) of medical cannabinoids by searching various databases for randomized clinical trials of cannabinoids for a variety of indications. The researchers identified 79 trials (6,462 participants) that met criteria for inclusion in the review and meta-analysis.
The researchers found that most studies suggested that cannabinoids were associated with improvements in symptoms, but these associations did not reach statistical significance in all studies. There was moderate-quality evidence to suggest that cannabinoids may be beneficial for the treatment of chronic neuropathic or cancer pain and spasticity due to multiple sclerosis (sustained muscle contractions or sudden involuntary movements). There was low-quality evidence suggesting that cannabinoids were associated with improvements in nausea and vomiting due to chemotherapy, weight gain in HIV, sleep disorders, and Tourette syndrome; and very low-quality evidence for an improvement in anxiety. There was low-quality evidence for no effect on psychosis and very low-level evidence for no effect on depression.
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. There was no clear evidence for a difference in association (either beneficial or harmful) based on type of cannabinoids or mode of administration. Only 2 studies evaluated cannabis. There was no evidence that the effects of cannabis differed from other cannabinoids.
"Further large, robust, randomized clinical trials are needed to confirm the effects of cannabinoids, particularly on weight gain in patients with HIV/AIDS, depression, sleep disorders, anxiety disorders, psychosis, glaucoma, and Tourette syndrome are required. Further studies evaluating cannabis itself are also required because there is very little evidence on the effects and AEs of cannabis," the authors write.