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The elimination kinetics of disopyramide, [14C]disopyramide and [2H]disopyramide have been studied in the isolated perfused rat liver. Disappearance of disopyramide from perfusate was dose- and time-dependent over the dose range 0.3-7.5 mg. Although the mechanism underlying these observations is unclear, the data are consistent with the presence of enzyme saturation and product inhibition. Biliary secretion of conjugated metabolites appeared to be the rate-limiting step in the perfusate clearance of total radioactivity. At doses of 0.3 and 7.5 mg the kinetics of [2H]disopyramide showed a small isotope effect probably of negligible importance.
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