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In page Halothane:

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Halothane activates GABAA and glycine receptors.[1][2] It also acts as an NMDA receptor antagonist,[2] inhibits nACh and voltage-gated sodium channels,[1][3] and activates 5-HT3 and twin-pore K+ channels.[1][4] It does not affect the AMPA or kainate receptors.[2]