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The aim of the present study was to examine the dose-independent kinetics of trimethadione (1) and its only metabolite dimethadione, 5,5-dimethyl-2,4-oxazolidinedione (2), after oral administration of 1-, 2-, and 4-mg/kg doses of 1 to rats. Pharmacokinetic parameters determined after oral administration of these doses showed that the half-life (t 1/2), metabolic clearance (CL), and apparent volume of distribution (Vd) were not significantly changed by increasing or decreasing the dose of 1, whereas there was a linear relationship between the dose of 1 and the area under the curve (AUC) (1, r = 0.912; 2, r = 0.976) or the maximum serum concentration (Cmax) (1, r = 0.990; 2, r = 0.980). The ratios of 2 to 1 at 1 and 2 h after oral administration of 1 were not significantly different. These experiments indicate that serum pharmacokinetic behavior of 1 and 2 1 or 2 h after oral administration of 1 to the rat is independent of the dose of 1 in the 1-4 mg/kg range.
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