Abstract
Diltiazem has been reported to decrease or not to affect digoxin elimination. The effects of diltiazem on steady state concentrations of digoxin was evaluated in eleven patients with congestive heart failure receiving this drug for at least two weeks. The mean trough digoxin was 1.11 +/- 0.18 ng/ml before the coadministration of diltiazem (180 mg/day). This concentration increased to 1.54 +/- 0.22 ng/ml after three days and to 1.54 +/- 0.23 ng/ml after seven days of coadministration (P less than 0.01). Clinically, no patient showed signs of digitalis toxicity. Creatinine clearance was unchanged. The present results show that when diltiazem is added to a regimen that includes digoxin, steady state concentrations of this glycoside may increase.
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