Dravet is usually caused by a spontaneous  not inherited  genetic mutation present at birth that affects the functioning of brain cells, according to the National Institute of Neurological Disorders and Stroke. Its hallmark is severe seizures during the first year of life that are difficult to control. Many children with Dravet, which occurs in one in every 20,000 to 40,000 births, also exhibit poor language skills, behavioral problems and cognitive deficits. There is no cure for Dravet, but some medications are effective in controlling seizures. Among them are clobazam combined with stiripentol, a French drug that has not been approved by the Food and Drug Administration but can be legally imported because it treats a rare illness.