Abstract
The role of the kidneys in the elimination of theophylline was directly assessed using nephrectomized dogs. Data was analyzed by two different pharmacokinetic approaches. Analysis indicated that a given dosage regimen produced significantly different serum concentrations before and after nephrectomy. Model independent pharmacokinetic analysis failed to show a significant difference in parameters. A model dependent approach, using a nonlinear regression analysis employing a linear two-compartment model, demonstrated that the differences observed could be accounted for by a change in the first order elimination kinetics.
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