Evidence In 2014, there was little evidence about the safety or efficacy of cannabinoids in the treatment of epilepsy. A 2014
Cochrane review did not find enough evidence to draw conclusions about its use. A 2014
review by the
American Academy of Neurology similarly concluded that "data are insufficient to support or refute the efficacy of cannabinoids for reducing seizure frequency." The Cochrane review suggests cannabinoids be reserved for people with symptoms that are not controllable by other means, who have been evaluated by
EEG-video monitoring to confirm diagnosis, and are not eligible for better-established treatments such as surgery and
neurostimulation. A second review described four placebo-controlled trials of cannabidiol including 48 people with a disease that was not manageable by other means. Three out of four trials reported some reduction in seizures, but no comparison with placebo was possible due to the small number of people in the trials. The drugs were well tolerated. A third review found that no reliable conclusions about the effect of cannabis on epilepsy could be drawn due to the poor quality of available data, but further research may be warranted because of the good safety profile observed in small clinical trials.
Statements Due to the
anecdotal nature of the health claims being made, medical bodies have published statements of concern. A 2014 position statement by the American Epilepsy Society stated: The recent anecdotal reports of positive effects of the marijuana derivative cannabidiol for some individuals with treatment-resistant epilepsy give reason for hope. However, we must remember that these are only anecdotal reports, and robust scientific evidence for the use of marijuana is lacking... at present, the epilepsy community does not know if marijuana is a safe and effective treatment, nor do they know the long-term effects that marijuana will have on learning, memory, and behavior, especially in infants and young children. Cannabis-derived products were not mentioned in the
National Institute for Health and Care Excellence epilepsy treatment guidelines in 2012. == Society and culture ==