Abstract

We examined possible interactions between neuroleptics and the histamine H3 receptor and found an interaction of clozapine with this receptor. In competition binding experiments, using the H3 antagonist, [125I]-iodophenpropit, we observed a Ki of 236 +/- 87 nM. Functionally, clozapine was studied on the H3-mediated inhibition of [3H]-5-hydroxytryptamine ([3H]-5-HT) release from rat brain cortex slices. Clozapine acts as an antagonist with an apparent KB value of 79.5 nM.

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