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The US Food and Drug Administration (FDA) stated in a Q&A section titled "FDA Regulation of Cannabis and Cannabis-Derived Products: Questions and Answers," available at fda.gov and last updated Apr. 3, 2019:

“FDA is aware that unapproved cannabis or cannabis-derived products are being used for the treatment of a number of medical conditions including, for example, AIDS wasting, epilepsy, neuropathic pain, spasticity associated with multiple sclerosis, and cancer and chemotherapy-induced nausea.

To date, FDA has not approved a marketing application for cannabis for the treatment of any disease or condition and thus has not determined that cannabis is safe and effective for any particular disease or condition.”

Apr. 3, 2019