Physiological disposition of a series of rifamycins in rat: A comparative study.

Abstract
Disposition of four C3-substituted piperazinyl rifamycins was studied in the rat following the i.v. administration of 5 mg/kg of [14C]-labelled antibiotics. Considerable quantitative differences in pharmacokinetics were shown in blood levels, tissue distributions and body clearances. Feces were largely the major route of elimination for the parent drug and metabolites. Liver compartmentalization, regulating the biliary excretion, may be the kinetic parameter affecting the pharmacokinetic behavior of rifamycins.

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