Abstract.
Rationale: It has been suggested that the antipsychotic effect of antipsychotics is mediated by the antagonism of the dopamine D2 receptor in the limbic-cortical regions. Risperidone has an atypical property, but its effect on limbic-cortical regions has not been evaluated. Objectives: In this study, we examined the relationship among doses of risperidone and limbic-cortical dopamine D2 receptor occupancy using positron emission tomography. Methods: Seven patients with schizophrenia were scanned during the steady state with risperidone. Their occupancies in limbic-cortical regions were determined using positron emission tomography with [11C]FLB 457. Results: The average occupancy ranged from 38% to 80% on doses of 1–6 mg/day. The saturation curve plotted against the drug level fit the data well. Conclusions: Our results demonstrate that the D2 receptor occupancy with risperidone in the limbic-cortical regions seems to be similar to that of previous reports regarding the striatum, and it would be comparable to that of typical antipsychotics.
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Yasuno, F., Suhara, T., Okubo, Y. et al. Dose relationship of limbic-cortical D2-dopamine receptor occupancy with risperidone. Psychopharmacology 154, 112–114 (2001). https://doi.org/10.1007/s002130000643
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DOI: https://doi.org/10.1007/s002130000643