Described are methods of treating or reducing the toxic effects of exposure to a nerve agent, comprising administering to a subject in need thereof (i) an AMPA/GluR5(GluK1) kainate receptor antagonist (such as LY293558) and (ii) an NMD A receptor antagonist (such as an antimuscarinic compound, such as caramiphen), as well as methods of treating, reducing the risks of, or preventing a neurological condition such as epilepsy, seizures, post-traumatic stress disorder, status epilepticus, depression, or anxiety, comprising administering to a subject in need thereof (i) an AMPA/GluR5(GluK1) kainate receptor antagonist (such as LY293558) and (ii) an NMDA receptor antagonist (such as an antimuscarinic compound, such as caramiphen). The methods may further comprise administering a positive allosteric modulator of synaptic GABAA receptors, such as a benzodiazepine, such as midazolam, to the subject. The methods are suitable for use in children and adults. Related compositions and uses also are described.