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Int J Antimicrob Agents. 2014 Sep;44(3):229-34. doi: 10.1016/j.ijantimicag.2014.04.019. Epub 2014 Jun 9.

Population pharmacokinetics and limited sampling strategy for first-line tuberculosis drugs and moxifloxacin.

Author information

1
Radboud University Medical Centre, Department of Pulmonary diseases, Nijmegen and University Centre for Chronic Diseases Dekkerswald, Groesbeek, The Netherlands. Electronic address: Cecile.Magis-Escurra@Radboudumc.nl.
2
Radboud University Medical Centre, Department of Pharmacy, Nijmegen, The Netherlands.
3
University Medical Centre Groningen, Department of Hospital and Clinical Pharmacy, Groningen, The Netherlands.
4
Radboud University Medical Centre, Department of Internal Medicine, Nijmegen, The Netherlands.
5
Radboud University Medical Centre, Department of Pulmonary diseases, Nijmegen and University Centre for Chronic Diseases Dekkerswald, Groesbeek, The Netherlands.
6
Radboud University Medical Centre, Department for Epidemiology, Biostatistics and HTA, Nijmegen, The Netherlands.
7
University Medical Centre Groningen, Tuberculosis Centre Beatrixoord, Haren, The Netherlands.
8
University Medical Centre Groningen, Tuberculosis Centre Beatrixoord, Haren, The Netherlands; University Medical Centre Groningen, Department of Internal Medicine, Groningen, The Netherlands.

Abstract

Therapeutic drug monitoring (TDM) of tuberculosis (TB) drugs currently focuses on peak plasma concentrations, yet total exposure [area under the 24-h concentration-time curve (AUC₀₋₂₄)] is probably most relevant to the efficacy of these drugs. We therefore assessed population AUC₀₋₂₄ data for all four first-line TB drugs (rifampicin, isoniazid, pyrazinamide and ethambutol) as well as moxifloxacin and developed limited sampling strategies to estimate AUC₀₋₂₄ values conveniently. AUC₀₋₂₄ and other pharmacokinetic (PK) parameters were determined following intensive PK sampling in two Dutch TB referral centres. Best subset selection multiple linear regression was performed to derive limited sampling equations. Median percentage prediction error and median absolute percentage prediction error were calculated via jackknife analysis to evaluate bias and imprecision of the predictions. Geometric mean AUC₀₋₂₄ values for rifampicin, isoniazid, pyrazinamide, ethambutol and moxifloxacin were 41.1, 15.2, 380, 25.5 and 33.6 hmg/L, respectively. Limited sampling at various fixed sampling points enabled an accurate and precise prediction of AUC₀₋₂₄ values of all drugs separately and simultaneously. In the absence of clinically validated target values for AUC₀₋₂₄, average AUC₀₋₂₄ values can be used as reference values in TDM. Limited sampling of AUC₀₋₂₄ is feasible in many settings and allows for TDM to be performed at a larger scale.

KEYWORDS:

Limited sampling strategy; Population pharmacokinetics; TB drugs

[Indexed for MEDLINE]

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