Abstract
Background and Objectives
Valganciclovir is used as oral prophylaxis for cytomegalovirus (CMV) infection in kidney transplant recipients. However, limited pharmacokinetic data exist to guide dosing in this patient group. This study aimed to describe the population pharmacokinetics of valganciclovir in a large sample of kidney transplant recipients and predict optimal dosing based on Monte Carlo simulations.
Methods
Therapeutic drug monitoring (TDM) data from adult kidney transplant recipients who received valganciclovir prophylaxis during a 10-year study period were collected retrospectively. A non-parametric pharmacokinetic analysis and Monte Carlo simulations to determine the probabilities of reaching an area under the drug concentration–time curve (AUC) target of 40–50 mg·h/L with various dosing regimens at different levels of renal function were conducted using the Pmetrics™ package for R.
Results
This study included 792 ganciclovir concentration measurements derived from 97 patients. A one-compartment oral absorption model best described the data. The final covariate model was as follows: CL(ganciclovir) = TVCL × (CLCR/51)0.75, where CL is the clearance, TVCL is the typical value of ganciclovir clearance, creatinine clearance (CLCR) according to the Cockcroft-Gaultt equation and 51 is the mean CLCR determined in the study. In the simulations, the probability of reaching the targeted AUC was insufficient when using the recommended dosing regimens for prophylaxis, especially in patients with impaired renal function at CLCR < 50 mL/min.
Conclusions
Higher doses of valganciclovir corrected to renal function are suggested for use as oral prophylaxis for CMV infection in kidney transplant recipients. Further study is required to establish TDM targets to ensure adequate drug concentrations while avoiding potentially toxic drug exposures.
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References
Cvetković RS, Wellington K. Valganciclovir: a review of its use in the management of CMV infection and disease in immunocompromised patients. Drugs. 2005;5:859–78.
Lowance D, Neumayer HH, Legendre CM, et al. Valganciclovir for the prevention of cytomegalovirus disease after renal transplantation. N Engl J Med. 1999;340:1462–70.
Jung D, Dorr A. Single-dose pharmacokinetics of valganciclovir agents for solid organ transplantation. J Clin Pharmacol. 1999;39:800–4.
Pescovitz MD, Rabkin J, Merion RM, et al. Valganciclovir results in improved oral absorption of ganciclovir in liver transplant recipients. Antimicrob Agents Chemother. 2000;44:2811–5.
McGavin JK, Goa KL. Ganciclovir: an update of its use in the prevention of cytomegalovirus infection and disease in transplant recipients. Drugs. 2001;61:1153–83.
Wiltshire H, Paya CV, Pescovitz MD, et al. Pharmacodynamics of oral ganciclovir and valganciclovir in solid organ transplant recipients. Transplantation. 2005;79:1477–83.
Caldés A, Colom H, Armendariz Y, et al. Population pharmacokinetics of ganciclovir after intravenous ganciclovir and oral valganciclovir administration in solid organ transplant patients infected with cytomegalovirus. Antimicrob Agents Chemother. 2009;53:4816–24.
Yuen GJ, Drusano GL, Fletcher C, et al. Population differences in ganciclovir clearance as determined by nonlinear mixed-effects modelling. Antimicrob Agents Chemother. 1995;39:2350–2.
Perrottet N, Decosterd LA, Meylan P, Pascual M, Biollaz J, Buclin T. Valganciclovir in adult solid organ transplant recipients: pharmacokinetic and pharmacodynamic characteristics and clinical interpretation of plasma concentration measurements. Clin Pharmacokinet. 2009;48:399–418.
Boulieu R, Bleyzac N, Ferry S. High-performance liquid chromatographic determination of ganciclovir in plasma. J Chromatogr. 1991;567:481–4.
Tatarinova T, Neely M, Bartroff J, et al. Two general methods for population pharmacokinetic modeling: non-parametric adaptive grid and non-parametric Bayesian. J Pharmacokinet Pharmacodyn. 2013;40:189–99.
Neely M, van Guilder M, Yamada W, Schumitzky A, Jelliffe R. Accurate detection of outliers and subpopulations with Pmetrics, a non-parametric and parametric pharmacometric modeling and simulation package for R. Ther Drug Monit. 2012;34:467.
Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976;16:31–41.
Levey AS, Stevens AL, Schmid CH, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009;150:604–12.
Mentré F, Escolano S. Prediction discrepancies for the evaluation of nonlinear mixed-effects models. J Pharmacokinet Pharmacodyn. 2006;33:345–67.
Padullés A, Colom H, Bestard O, et al. Contribution of population pharmacokinetics to dose optimization of ganciclovir in solid organ transplant patients. Antimicrob Agents Chemother. 2016;60:1992–2002.
Vezina H, Brundage RC, Balfour HH. Population pharmacokinetics of valganciclovir prophylaxis in paediatric and adult solid organ transplant recipients. Br J Clin Pharmacol. 2014;78:343–52.
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Funding
This work was supported by internal funding. We wish to recognise funding from the Australian National Health and Medical Research Council for a Centre of Research Excellence (APP1099452). JAR is funded in part by a Practitioner Fellowship (APP1117065) from the National Health and Medical Research Council of Australia.
Conflict of interest
Thomas Tängdén, Pier Giorgio Cojutti and Federico Pea declare no conflicts of interest. Jason A. Roberts has received investigator-initiated grants from, or has consulted for, bioMérieux, Astellas, MSD and Cardeas Pharma.
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Tängdén, T., Cojutti, P.G., Roberts, J.A. et al. Valganciclovir Pharmacokinetics in Patients Receiving Oral Prophylaxis Following Kidney Transplantation and Model-Based Predictions of Optimal Dosing Regimens. Clin Pharmacokinet 57, 1399–1405 (2018). https://doi.org/10.1007/s40262-018-0638-5
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DOI: https://doi.org/10.1007/s40262-018-0638-5