Patients with epilepsy whose seizures do not effectively respond to two antiseizure medications are considered to have drug-resistant epilepsy (DRE). DRE accounts for approximately 30% of the adult population living with epilepsy. Your epileptologist may refer you for a surgical workup if you have DRE. The objective of surgery is to decrease seizures, the severity of seizures, or to become seizure-free. We offer many types of epilepsy surgery at Denver Health. Epilepsy surgery evaluation often involves figuring out what type of epilepsy you have, where the seizures are starting from in your brain, and if this is an area of the brain where surgery can be done. The possible epilepsy surgery treatment options are decided based on the answers to these questions.