PMID: 8597321Mar 15, 1996Paper

Increased plasma rifabutin levels with concomitant fluconazole therapy in HIV-infected patients

Annals of Internal Medicine
C B TrapnellJ P Lavelle

Abstract

To determine the effect of fluconazole on rifabutin pharmacokinetics. An open-label, crossover, phase 1 trial. Outpatient clinical research center at a university medical center in Washington, D.C. 12 persons with human immunodeficiency virus (HIV) infection whose CD4 lymphocyte counts were between 200 and 500 cells/mm3 and who were receiving maintenance therapy with zidovudine. Fluconazole, 200 mg/d for 2 weeks; then a combination of fluconazole, 200 mg/d, and rifabutin, 300 mg/d, for 2 weeks; and then rifabutin, 300 mg/d, for the final 2 weeks of the study. Blood and urine samples were obtained at regular intervals for 24 hours at the end of each 2-week dosing period to ascertain concentrations of fluconazole and rifabutin and the 25-desacetyl metabolite of rifabutin, LM565. Fluconazole significantly increased the plasma concentrations of both rifabutin and LM565. Mean increases in the area under the plasma concentration curve compared with the time curve over a 24-hour dosing interval were 82% (5442 +/- 2404 ng.h/mL compared with 3025 +/- 1117 ng.h/mL; P less than or equal to 0.05) for rifabutin and 216% (959 +/- 529 ng.h/mL compared with 244 +/- 141 ng.h/mL; P less than or equal to 0.05) for LM565. Fluconazole significantly...Continue Reading

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