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Free Content In vitro reaction phenotyping studies on rifamycins to explain the auto-induction of rifabutin metabolism [Short communication]

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A study was carried out to establish the relative contribution of human cytochrome P450 (CYP450) enzymes in the metabolism of rifampicin (RMP), rifapentine (RPT) and rifabutin (RFB). It involved the incubation of the three drugs in five major CYP450 isoforms. Both RMP and RPT showed minimal metabolism by CYP450 enzymes, whereas RFB showed extensive metabolic degradation by CYP3A4. A known inducer of CYP3A4, RFB was shown in this study to be also a substrate for the same enzyme. The latter might be one of the reasons for the auto-induction of RFB metabolism and the consequent lower bioavailability of the drug on repeated administration.

Keywords: auto-induction; reaction phenotyping; rifabutin; rifampicin; rifapentine

Document Type: Research Article

DOI: http://dx.doi.org/10.5588/ijtld.11.0125

Affiliations: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research, SAS Nagar, India

Publication date: February 1, 2012

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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