Methods and compositions for treating a seizure disorder are provided which include administering to the patient a vector encoding a modified receptor for delivery of the modified receptor to the target location, the modified receptor being modified to be activated by a synthetic ligand, wherein the modified receptor inhibits neuronal firing when activated； and administering to the patient the synthetic ligand. Also provided are methods and compositions for treating a seizure disorder in a patient in need thereof by administering to the patient a vector encoding a modified receptor for delivery of the modified receptor to the target location, the modified receptor being modified to be activated by a synthetic ligand, wherein the modified receptor increases neuronal firing when activated； and administering to the patient the synthetic ligand. The methods are used to improve or alleviate one or more symptoms of a seizure disorder.
