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Cannabis legalization in multiple states has resulted in self-directed use for various medical conditions. These authors reviewed 83 studies (40 randomized, controlled trials [RCTs]) of medical cannabinoids.
Most studies focused on treatment with largely pharmaceutical-grade tetrahydrocannabinol (THC), cannabidiol (CBD), or their combination (e.g., nabilone, nabiximols, dronabinol); few studies focused on medicinal plant-based marijuana, and very few investigated CBD specifically. Meta-analysis was used for RCTs; narrative synthesis was used for observational studies. In most depression and anxiety studies, the psychiatric condition was secondary to a medical condition. No consistent evidence of benefit was found for psychosis, depression, a…