
Am J Psychiatry 157:1019-1020, June 2000
© 2000 American Psychiatric Association
Subjective Experience and Striatal Dopamine D2 Receptor Occupancy in Patients With Schizophrenia Stabilized by Olanzapine or Risperidone
Lieuwe de Haan, M.D.,
Jules Lavalaye, M.D.,
Don Linszen, M.D., Ph.D.,
Peter M.A.J. Dingemans, Ph.D., and
Jan Booij, M.D., Ph.D.
OBJECTIVE: The authors goal was to study the relationship between subjective experience during treatment with olanzapine or risperidone and dopamine D2 receptor occupancy in stabilized patients with schizophrenia.METHOD: Subjective experience, psychopathology, and extrapyramidal symptoms were assessed, and D2 receptor occupancy was determined with [123I]iodobenzamide single photon emission computed tomography, in 22 patients whose schizophrenia was stabilized by olanzapine or risperidone.RESULTS: Subjective experience, depression, and negative symptoms were related to dopamine D2 receptor occupancy, but extrapyramidal symptoms were not.CONCLUSIONS: These results provide preliminary evidence that negative subjective experience is related to high D2 receptor occupancy. Longitudinal study is required because this relationship may have implications for dosing strategies.
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