Abstract
1. In chloralose-anaesthetized cats the centrally induced hypotensive effect of clonidine, and in some cases alpha-methyldopa, was diminished by pretreatment with a variety of tricyclic antidepressants and neuroleptic agents. 2. The interaction is assumed to occur at the central alpha-adrenoreceptors. Clonidine or alpha-methyl-noradrenaline (from alpha-methyldopa) are the agonists, and the aforementioned psychotropic drugs are the antagonists. 3. Psychotropic drugs which are not alpha-receptor blockers, like butyrophenone neuroleptics (pimozide and haloperidol) or benzodiazepine tranquillizers, do not significantly diminsh the centrally induced hypotensive effect of clonidine.
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