Digitoxin elimination reduced during quinidine therapy.

Abstract:

:Elevated serum digoxin concentrations and clinical toxicity have been reported in patients receiving quinidine. The present study was undertaken to ascertain whether a similar interaction occurs between quinidine and another cardiac glycoside, digitoxin, and if so to evaluate the pharmacokinetic basis in five healthy volunteers. In the presence of quinidine the serum digitoxin concentration was elevated, the mean digitoxin elimination half-life was increased from 87.8 +/- 11.6 to 218.3 +/- 20.6 h (mean +/- SEM) (p < 0.01), and mean total body clearance was reduced from 5.01 +/- 1.18 to 1.87 +/- 0.20 mL/h x kg (p < 0.052). No change was observed in the apparent volume of distribution or in the volume of the central compartment for digitoxin. The data suggest that the mechanism for this interaction is a reduction in elimination and not displacement of digitoxin from tissue binding sites.

journal_name

Ann Intern Med

authors

Garty M,Sood P,Rollins DE

doi

10.7326/0003-4819-94-1-35

subject

Has Abstract

pub_date

1981-01-01 00:00:00

pages

35-7

issue

1

eissn

0003-4819

issn

1539-3704

journal_volume

94

pub_type

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