Management of drug-resistant epilepsy
Drug-resistant epilepsy (DRE), also known as refractory epilepsy, intractable epilepsy, or pharmacoresistant epilepsy, refers to a state in which an individual with a diagnosis of epilepsy is unresponsive to multiple first-line therapies. Based on the 2010 guidelines from the International League against Epilepsy (ILAE), DRE is officially diagnosed following a lack of therapeutic relief in the form of continued seizure burden after trialing at least two antiepileptic drugs (AEDs) at the appropriate dosage and duration.
Source: Wikipedia — Management of drug-resistant epilepsy (CC BY-SA 4.0)