Seizures are caused by uncontrolled electrical activity between brain cells which can cause symptoms such as violent shaking or loss of control. Someone with epilepsy experiences repeated seizures. There is good evidence that the CBD chemical derived from the cannabis plant can reduce the frequency of seizures by 50% or more among young people with treatment resistant forms of epilepsy, such as Lennox-Gastaut and Dravet Syndrome. However, CBD does not work for everyone who experiences seizures. Research shows that out of 8 people who are prescribed CBD, only 1 will experience a 50% or more reduction in seizures.