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The effects of cardiac transplantation and cyclosporine therapy on digoxin pharmacokinetics

I Robieux, P Dorian, J Klein, D Chung, D Zborowska-Sluis, R Ogilvie, and G Koren

Most patients needing cardiac transplantation are treated with digoxin for heart failure. Because of its narrow therapeutic range, even recommended doses of digoxin may cause severe toxicity. Several drugs, including quinidine, amiodarone, verapamil, and propafenone can interact with digoxin, leading to toxic accumulation of the glycoside. The authors have recently reported two cases of severe digitalis toxicity after the initiation of cyclosporine treatment in patients awaiting cardiac transplantation. A preliminary study on two additional patients suggested that cyclosporine reduced the plasma clearance and volume of distribution of digoxin. To assess the mechanism of this interaction, the authors studied digoxin pharmacokinetics in patients awaiting cardiac transplantation and again after the surgery, during chronic cyclosporine therapy. To separate the effects of transplantation and cyclosporine on digoxin pharmacokinetics, pharmacokinetic studies were subsequently performed in dogs to allow controlled experimental conditions for evaluation of the digoxin-cyclosporine interaction.
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M. F. Fromm, R. B. Kim, C. M. Stein, G. R. Wilkinson, and D. M. Roden
Inhibition of P-Glycoprotein–Mediated Drug Transport : A Unifying Mechanism to Explain the Interaction Between Digoxin and Quinidine
Circulation, February 2, 1999; 99(4): 552 - 557.
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