“Cannabis has been used to treat disease since ancient times. Δ9 -Tetrahydrocannabinol (Δ9 -THC) is the major psychoactive ingredient and CBD is the major nonpsychoactive ingredient in cannabis.
Cannabis and Δ9 -THC are anticonvulsant in most animal models but can be proconvulsant in some healthy animals. The psychotropic effects of Δ9 -THC limit tolerability.
CBD is anticonvulsant in many acute animal models, but there are limited data in chronic models.
The antiepileptic mechanisms of CBD are not known, but may include effects on the equilibrative nucleoside transporter; the orphan G-protein-coupled receptor GPR55; the transient receptor potential of vanilloid type-1 channel; the 5-HT1a receptor; and the α3 and α1 glycine receptors.
CBD has neuroprotective and antiinflammatory effects, and it appears to be well tolerated in humans, but small and methodologically limited studies of CBD in human epilepsy have been inconclusive.
More recent anecdotal reports of high-ratio CBD:Δ9 -THC medical marijuana have claimed efficacy, but studies were not controlled.
CBD bears investigation in epilepsy and other neuropsychiatric disorders, including anxiety, schizophrenia, addiction, and neonatal hypoxic-ischemic encephalopathy.”