Influence of coadministration on the pharmacokinetics of azimilide dihydrochloride and digoxin.

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Toothaker RD, Corey AE, Valentine SN, Agnew JR, Parekh N, Moehrke W, Thompson GA, Powell JH

Influence of coadministration on the pharmacokinetics of azimilide dihydrochloride and digoxin.

J Clin Pharmacol. 2005 Jul;45(7):773-80.

PubMed ID
15951467 [ View in PubMed
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Abstract

The influence of coadministration on digoxin and azimilide pharmacokinetics/pharmacodynamics was assessed in a randomized, 3-way crossover study in 18 healthy men. Serial blood and urine samples were obtained for azimilide and digoxin quantitation. Treatment effects on pharmacokinetics were assessed using analysis of variance. The relationship between azimilide blood concentrations and QT(c) prolongation was characterized by an E(max) model. Effects of coadministration on pharmacodynamics were assessed using a mechanistic-based inhibition model. Azimilide pharmacokinetics was unaffected by digoxin, except for a 36% increase in CL(r) (P = .0325), with no change in CL(o). Digoxin pharmacokinetics was unaffected by azimilide, except for a 21% increase in C(max) (P = .0176) and a 10% increase in AUC(tau) (P = .0121). Digoxin coadministration increased the apparent EC(50) with no effect on E(max), consistent with competitive inhibition (K(i) = 0.899 ng/mL). The pharmacokinetic and pharmacodynamic changes observed upon coadministration were small and are not expected to be clinically important.

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