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Nephrology Dialysis Transplantation, Vol 13, Issue 5 1189-1193, Copyright © 1998 by Oxford University Press

ORIGINAL ARTICLES

Pharmacokinetics of pantoprazole in patients with end-stage renal failure

V Kliem, J Bahlmann, M Hartmann, R Huber, R Luhmann and W Wurst
Abteilung Nephrologie, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany; Byk Gulden Pharmaceuticals, Konstanz, Germany; Corresponding author

Background: Pantoprazole is a selective inhibitor of the gastric H+/K+-ATPase with a low potential to interact with the cytochrome P450 enzyme system. Since pantoprazole is metabolized in the liver to metabolites which are mainly cleared by the renal route, it was the aim of this study to investigate its pharmacokinetics in patients with end-stage renal failure undergoing regular haemodialysis. Methods: Eight patients with end-stage renal failure (creatinine clearance <5 ml/min, age 45-65 years) on regular haemodialysis (duration of haemodialysis 4-5 h, cuprophan-dialyser Hemoflow E3, surface 1.3 m2) were given single i.v. doses of 40 mg pantoprazole one day before haemodialysis (A) and on a haemodialysis day immediately before the start of the haemodialysis (B). Concentrations of pantoprazole and metabolite M2 were determined in plasma and urine over 24 h and in timed samples of the dialysis fluid by HPLC. The protein binding was determined using equilibrium dialysis. Results: The pharmacokinetic characteristics of pantoprazole AUC, t½, CL and Vd area (geometric means) were 2.4 mgxh/l, 0.63 h, 0.227 l/h/kg and 0.206 l/kg on day A (without dialysis) and 2.3 mgxh/l, 0.8 h 0.237 l/h/kg and 0.273 l/kg on day B (with dialysis), respectively. The protein binding was 96%. Pantoprazole was found in small amounts in the dialysis fluid (max. 2.1% of the dose) but not in the urine. Pantoprazole was well tolerated. In particular, there were no clinically relevant changes in blood count, electrolytes or liver enzymes. Conclusions: Haemodialysis has no influence on the pharmacokinetic characteristics of pantoprazole. Thus, pantoprazole is not dialysed to any relevant degree, and therefore no dose-adjustment is required for patients with endstage renal failure undergoing regular haemodialysis treatment. Key words: pantoprazole; renal impairment; haemodialysis; proton-pump inhibitor
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