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Unexpected drug-drug interaction between tipranavir/ritonavir and enfuvirtide
Daniel González de Requena1, Andrea Calcagno, Stefano Bonora
1Department of Infectious Diseases, University of Turin, Turin, Italy.
Abstract:
Fifty-five patients placed on tipranavir/ritonavir 500/200 mg twice a day (27 with enfuvirtide and 28 without) underwent tipranavir and ritonavir plasma concentration measurements by high-pressure liquid chromatography. Markedly higher tipranavir and ritonavir trough concentrations were observed in enfuvirtide recipients. The modelling of sparse plasma samples using a first order absorption and elimination monocompartmental model without time lag predicted higher tipranavir elimination half-life and volume of distribution in enfuvirtide takers. This unexpected drug-drug interaction warrants further investigation.
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