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Plasma Protein and Lipoprotein Distribution of Clozapine

OBJECTIVE: The authors’ goal was to determine what effect dyslipidemia has on clozapine’s plasma distribution. METHOD: [³H]Clozapine plus cold clozapine (335 ng/ml) were incubated in plasma samples with varying total cholesterol, lipoprotein cholesterol, and triglyceride concentrations. Following incubation, the plasma was separated into its lipoprotein and lipoprotein-deficient fractions by density gradient ultracentrifugation and clozapine distribution was determined. RESULTS: Compared with the plasma standard, significantly more clozapine was recovered in the very-low-density lipoprotein fraction, which contained elevated total cholesterol and triglycerides. Correlation analysis revealed a positive correlation between total plasma triglyceride concentration and clozapine recovery in this fraction. CONCLUSIONS: In plasma samples with elevated triglycerides, clozapine shifts from the lipoprotein-deficient fraction to the very-low-density lipoprotein fraction. This redistribution of clozapine may affect the pharmacological activity of clozapine.

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