Abstract
Olanzapine is a new antipsychotic drug with affinity for 5-HT2, D2, D1, and muscarinic receptors. Positron emission tomography and the radioligands [11C]raclopride and [11C]NMSP were used to measure D2 and 5-HT2 receptor occupancy in three healthy subjects after 10 mg olanzapine orally. After seven hours D2 receptor occupancy was 63%, 62% and 59%, respectively. After 9.5 hours 5-HT2 receptor occupancy was 74%, 86% and 92%. D2 and 5-HT2 receptor occupancy was comparable to that found in patients continuously treated with clozapine. Clinical efficacy has been demonstrated for olanzapine in the dose range 5 to 15 mg per day. Extrapolation from our present observations after a 10 mg single-dose suggest, that at the lower end of the clinically examined dose range the D2 and 5-HT2 receptor occupancy should be similar to that induced by standard doses of clozapine. Detailed evaluation of the dose-response characteristics of olanzapine and direct clinical comparison to clozapine will thus provide valuable leads to the clarification of atypical antipsychotic action.
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Nyberg, S., Farde, L. & Halldin, C. A PET Study of 5-HT2 and D2 Dopamine Receptor Occupancy Induced by Olanzapine in Healthy Subjects. Neuropsychopharmacol 16, 1–7 (1997). https://doi.org/10.1016/S0893-133X(96)00218-7
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DOI: https://doi.org/10.1016/S0893-133X(96)00218-7
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