Medical Benefits of Marijuana Unclear
Researchers at the University of Bristol, UK, have carried out an analysis of dozens of trials of the medical benefits of cannabis or marijuana.
Dr. Penny Whiting and her team looked at 79 randomized trials including 6,462 participants. Overall, this contained “moderate-quality evidence” to support the use of cannabinoids (chemical compounds that are the active principles in cannabis or marijuana) for chronic pain or spasticity due to multiple sclerosis.
But the evidence suggesting that cannabinoids were associated with improvements in nausea and vomiting due to chemotherapy, sleep disorders, and Tourette syndrome was “lower-quality,” they report. The evidence that cannabinoids could improve anxiety, depression, or psychosis was “very low-quality.”
The evidence for a beneficial effect on psychosis was “low-quality,” and there was “very low-level evidence” for an effect on depression. Neither the type of cannabinoids used, nor mode of administration, appeared to affect the results.
They explain...
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