SUNDAY, Dec. 2, 2018 -- A marijuana-derived drug that helps control epileptic seizures appears to become less effective over time in some patients, a new Israeli study reports.
Cannabidiol (CBD) liquid has been proven effective against seizures, but about one-third of patients develop tolerance that blunts the drug's effectiveness, according to research presented Sunday at the American Epilepsy Society's annual meeting, in New Orleans.