Central D2-dopamine receptor occupancy in relation to antipsychotic drug effects: a double-blind PET study of schizophrenic patients
Abstract
The relationship between central D2-dopamine receptor occupancy and antipsychotic drug effects was examined in a double-blind study. Raclopride was the compound used to induce a selective occupancy of the D2-dopamine receptors. In addition, 11C-labeled raclopride was the radioligand used to measure occupancy by positron emission tomography (PET). Seventeen schizophrenic patients were randomly assigned to one of three parallel groups treated for 4 weeks with daily doses of 2, 6, or 12 mg of raclopride. D2-receptor occupancy was determined by PET at steady-state conditions in 13 patients who completed the study. A statistically significant relationship was demonstrated between antipsychotic effect and degree of D2-receptor occupancy (p < 0.05). Patients with extrapyramidal side effects had significantly higher D2-receptor occupancy than those without (p = 0.02). The finding of a relationship between selective occupancy of the D2-dopamine receptors and clinical effects in schizophrenic patients principally provides new support for the dopamine hypothesis of antipsychotic drug action.
References
Dopamine receptor binding predicts clinical and pharmacological potencies of antischizophrenic drugs
Time course of D2-dopamine receptor occupancy examined by PET after single oral doses of haloperidol
Citations
Clinical utility of drug measurement and pharmacokinetics: therapeutic drug monitoring in psychiatry
In vivo determination of striatal dopamine D2 receptor occupancy in patients treated with olanzapine
Application of Pharmacokinetic-Pharmacodynamic Modeling in Drug Delivery: Development and Challenges
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