The invention concerns the use of a gaseous mixture containing gas xenon
and gas nitrous oxide, and advantageously oxygen, for making all or part
of an inhalable medicine for preventing or treating neurointoxication in
a human. The xenon/nitrous oxide mixture of the invention acts on one or
more cerebral receptors to reduce the release and/or the effects of
dopamine, glutamate, serotonin, taurin, GABA, noradrenaline and/or any
other neurotransmitter. The proportion by volume of xenon of the mixture
ranges between 5 and 45%, and the proportion by volume of nitrous oxide
ranges between 10 and 50%, the balance is preferably oxygen.