Infectious Brain abscess Encephalitis Febrile (nonspecific) Meningitis Parasites (central nervous system) Syphilis Idiopathic Subtherapeutic anticonvulsant level Withdrawal Alcohol Hypnotics Toxicologic Anticonvulsant Camphor Carbon monoxide Cocaine Heavy metals (lead) Hypoglycemic agents Isoniazid Lithium Methylxanthines Pesticides (organophosphates) Phencyclidine Sympathomimetics Tricyclic antidepressants Topical anesthetics Degenerative cerebral disease Hypoxic ischemic injury Hepatic failure Metabolic Hyperosmolarity Hypocalcemia Hypoglycemia Hypomagnesemia