Effect of nifedipine on digoxin kinetics in healthy subjects

Abstract
Verapamil reduced total-body digoxin clearance by 35% due to impairments of both renal and extrarenal clearances. The influence of the related Ca antagonist nifedipine was evaluated on single-dose digoxin kinetics. Nifedipine increased extrarenal clearance of digoxin from 1.09 .+-. 0.30(SD) to 1.45 .+-. 0.23 ml/min per kg (P < 0.05) and reduced the total urinary recovery of the drug from 69.2% .+-. 5.9 to 64.3% .+-. 5.2 (P < 0.05). There were no significant changes in renal digoxin clearance, distribution or biological half-life or in digoxin distribution volumes during nifedipine coadministration.

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