Backing up what some parents have been claiming for years, researchers are now hailing a compound in marijuana as a "game-changing medication" for epilepsy. Based on testimonials from parents, Orrin Devinsky of NYU's Comprehensive Epilepsy Center set out to find proof that epilepsy could be treated with cannabidiol (CBD)—and he says he did.

In a 14-week study, 60 kids and teens with a severe form of epilepsy known as Dravet syndrome were given doses of CBD and saw their number of monthly convulsive seizures fall from 12 on average to about six, reports Live Science.

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Three patients saw their seizures stop entirely, the researchers say in the New England Journal of Medicine. One downside: Almost all patients who took CBD reported side effects, including vomiting and diarrhea, per Scientific American.

(CBD doesn't get users high.) But 62 percent of caregivers said the condition of the child in their care improved overall. That's compared to 34 percent of caregivers of children who took a placebo, who went from having about 15 monthly seizures to about 14.

Given this study and others, Devinsky says it's "medieval" that marijuana is deemed a Schedule I substance under the Controlled Substances Act. Drugs in this category have "no currently accepted medical use," according to the Drug Enforcement Administration, but that's "simply untrue," he says.

"To put CBD as a Schedule I drug violates scientific data and common sense." (More on CBD and epilepsy here.)

This article originally appeared on Newser: Marijuana Extract a 'Game-Changing Medication'