An excitatory amino acid receptor antagonist, or glutamate receptor antagonist, is a chemical substance which antagonizes one or more of the glutamate receptors. Examples include: * AP5 * Barbiturates * Dextromethorphan * Dextrorphan * Dizocilpine * Ethanol * Ibogaine * Ifenprodil * Ketamine * Kynurenic acid * Memantine * Nitrous oxide * Perampanel * Phencyclidine