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Phenytoin potentiation of neuroleptic-induced dyskinesias

✍ Scribed by K. D. Sethi; Ana Hitri; Bruce I. Diamond

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 253 KB
Volume: 5
Category: Article
ISSN: 0885-3185
DOI: 10.1002/mds.870050413

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✦ Synopsis

Abstract

Clinically phenytoin‐induced movement disorders may resemble neuroleptic‐induced tardive dyskinesia (TD). Neuroleptic‐induced TD is thought to be related to an increase in the number and affinity of dopamine D~2~ receptors. We investigated the interaction of phenytoin with dopaminergic systems by measuring dopamine behavior and receptor changes in animals treated with phenytoin alone or in combination with chlorpromazine. Phenytoin alone or in combination produced significant behavioral supersensitivity without alteration of dopamine D2 receptor density or affinity. This animal study suggests that phenytoin may aggravate neuroleptic‐induced tardive dyskinesia through mechanisms other than the dopamine D~2~ receptors.

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