 A 2017 study showed that the frequency of seizures per month decreased from 12 to 6 with the use of cannabidiol, compared with a decrease from 15 to 14 with placebo.Dravet syndrome is a severe form of epilepsy, responsible for roughly 10% of cases in children.It is a rare genetic disorder that affects an estimated 1 in every 20,000–40,000 births.