Effect of rifampicin on lopinavir pharmacokinetics in HIV-infected children with tuberculosis

Journal of Acquired Immune Deficiency Syndromes : JAIDS
Yuan RenHelen M McIlleron

Abstract

Rifampicin dramatically reduces plasma lopinavir concentrations (coformulated with ritonavir in a 4:1 ratio). A study in healthy adult volunteers showed that this reduction could be ameliorated if additional ritonavir is given. We evaluated the effect of additional ritonavir on plasma lopinavir concentrations in HIV-infected children receiving rifampicin-based treatment for tuberculosis. We measured plasma lopinavir concentrations in 2 parallel groups receiving combination antiretroviral therapy that included lopinavir-ritonavir, with and without rifampicin-based antitubercular treatment. Additional ritonavir was given (lopinavir/ritonavir ratio of 1:1) during antitubercular treatment. Lopinavir concentrations were determined using liquid chromatography-tandem mass spectrometry. There were 15 children (aged 7 months to 3.9 years) in each group. Lopinavir pharmacokinetic measures (median [interquartile range]) for children with and without rifampicin, respectively, were maximum concentration (Cmax) of 10.5 [7.1 to 14.3] versus 14.2 [11.9 to 23.5] mg/L (P = 0.018), area under the curve from 0 to 12 hours (AUC0-12) of 80.9 [50.9 to 121.7] versus 117.8 [80.4 to 176.1] mg/h/L (P = 0.036), and trough concentration (Cmin) of 3.94 [2.2...Continue Reading

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