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Picrotoxin definition: A noncompetitive antagonist at GABA-A receptors and thus a convulsant. Picrotoxin blocks the GAMMA-AMINOBUTYRIC ACID-activated chloride ionophore. Although it is most often used as a research tool, it has been used as a CNS stimulant and an antidote in poisoning by CNS depressants, especially the barbiturates.
picrotoxin definition: nonalkaloid extract from the seeds of Anamirta cocculus used as a CNS and respiratory stimulant to counteract toxicity of CNS depressants such as barbiturates; GABA-A receptor antagonist used to probe GABA function in the CNS.