Optimization of the Rifampin Dosage to Improve the Therapeutic Efficacy in Tuberculosis Treatment Using a Murine Model

Jurriaan de Steenwinkel, RE Aarnoutse, Gerjo Knegt, Marian ten Kate, M Teulen, Henri Verbrugh, MJ Boeree, D van Soolingen, Irma Woudenberg

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Abstract

Rationale: The dosage of 10 mg/kg/d rifampin, as currently used in the treatment of tuberculosis (TB), is not an optimal dose. Shortening of treatment duration might be achievable using an increased rifampin dose. Objectives: Determination of optimal rifampin dosage in mice, resulting in maximum therapeutic effect and without adverse effects. Assessment of associated pharmacokinetic parameters and pharmacokinetic/pharmacodynamic indices. Methods: A murine TB infection using a Beijing genotype Mycobacterium tuberculosis strain was established by intratracheal bacterial instillation followed by proper inhalation, while keeping mice in a vertical position. We assessed dose-dependent activity of rifampin in single-drug treatment during 3 weeks. The maximum tolerated dosage, pharmacokinetic parameters, and pharmacokinetic/pharmacodynamic index were determined. Therapeutic efficacy of a range of rifampin (R) dosages added to a regimen Measurements and Main Results: Maximum tolerated dosage of rifampin in the murine TB was 160 mg/kg/d. Pharmacokinetic measurement in HR(10) Z and HR(160) Z therapy regimens showed for rifampin a C-max of 16.2 and 157.3 mg/L, an AUC(0-24h) of 132 and 1,782 h.mg/L, and AUC(0-24h)/minimum inhibitory concentration ratios of 528 and 7129, respectively. A clear dose-effect correlation was observed for rifampin after 3-week single-drug treatment. Administration of HR(80) Z allowed 9-week treatment dura Conclusions: Our findings indicate that the currently used rifampin dosage in the therapy of TB is too low. In our murine TB model a rifampin dosage of 80 mg/kg/d enabled a significant reduction in therapy duration without adverse effects.
Original languageUndefined/Unknown
Pages (from-to)1127-1134
Number of pages8
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume187
Issue number10
DOIs
Publication statusPublished - 2013

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