Cannabidiol (CBD) is a phytocannabinoid discovered in 1940. It is one of some 113 identified cannabinoids in cannabis plants and accounts for up to 40% of the plant’s extract. As of 2018, preliminary clinical research on cannabidiol included studies of anxiety, cognition, movement disorders, and pain.Wikipedia, 2019
Cannabidiol can be taken into the body in multiple ways, including by inhalation of cannabis smoke or vapor, as an aerosol spray into the cheek, and by mouth. It may be supplied as CBD oil containing only CBD as the active ingredient (no included tetrahydrocannabinol [THC] or terpenes), a full-plant CBD-dominant hemp extract oil, capsules, dried cannabis, or as a prescription liquid solution. CBD does not have the same psychoactivity as THC, and may affect the actions of THC. As of 2018, the mechanism of action for its biological effects has not been determined.
In the United States, the cannabidiol drug Epidiolex was approved by the Food and Drug Administration in 2018 for treatment of two epilepsy disorders. The side effects of long-term use of the drug include somnolence, decreased appetite, diarrhea, fatigue, malaise, weakness, and sleeping problems.
As of April 2019, CBD extracted from marijuana remains a Schedule I drug classification, and is not approved as a prescription drug, dietary supplement, or allowed for interstate commerce in the United States.