Psychopharmacology (Berl). 1992;107(1):23-9.

Selective D1- and D2-dopamine receptor blockade both induces akathisia in humans--a PET study with [11C]SCH 23390 and [11C]raclopride.

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Department of Psychiatry and Psychology, Karolinska Institute, Stockholm, Sweden.

Abstract

Pharmacological effects were recorded and time course for receptor binding in brain was followed by positron emission tomography after IV injection of the selective D1-dopamine receptor antagonist SCH 23390 in four healthy subjects in doses of 310-810 micrograms. Akathisia, the syndrome of motor restlessness, appeared after the three highest doses. The akathisia was transient and occurred only when [11C]SCH 23390 binding in the basal ganglia was at a high level with a central D1-dopamine receptor occupancy of 45-59%. The D2-dopamine receptor antagonist [11C]raclopride was injected IV into 20 healthy subjects and 13 schizophrenic patients. Akathisia appeared in 14 healthy subjects and 7 patients and coincided with maximal [11C]raclopride binding in the basal ganglia. The findings for [11C]raclopride and [11C]SCH 23390 are the first demonstration of a relationship between time courses for radioligand binding in the human brain and simultaneously induced pharmacological effects.

PMID:: 1534178; [PubMed - indexed for MEDLINE]

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