Our son has had vns since 1998. But first they tried almost every seizure drug and combination of drugs for years and years. So vns might be helpful but doctors try meds first.
He takes 4 seizure meds and seizures are kept from being too severe. VNS helps some.
His seizures are so extreme that he has now received a deep brain stimulator. It hasn’t been programmed yet so still waiting to see results.
So try all the medications before considering a vns. The battery has to be surgically replaced every few years.