title: Biliary excretion of amoxycillin and ceftriaxone after intravenous administration in man.
abstract: 1 Plasma and biliary concentrations of amoxycillin and ceftriaxone were measured after bolus intravenous administration (500 mg) in four subjects with normal hepato-biliary and renal function. 2 The mean plasma elimination half-life for ceftriaxone (t 1/2 = 330 +/- 30 min) was considerably longer than that for amoxycillin (t 1/2 = 60 +/- 9 min). 3 The biliary concentration of ceftriaxone was above plasma concentration of the drug throughout the study period, whereas amoxycillin concentration in the bile was lower than that in plasma. 4 Both plasma and biliary concentrations of ceftriaxone were substantially higher than previously determined minimum inhibitory concentration (MIC) values for E. coli (and several other common biliary tract pathogens) for over 6 h following drug administration. Amoxycillin concentration in plasma fell below MIC by 2 h, and did not reach inhibitory concentrations in bile.
mesh_terms: D000328:Adult; D000658:Amoxicillin / Q000008:administration & dosage / Q000378:metabolism* / Q000652:urine; D001419:Bacteria / Q000187:drug effects; D001646:Bile / Q000378:metabolism*; D002439:Cefotaxime / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000378:metabolism / Q000652:urine; D002443:Ceftriaxone; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D013997:Time Factors
chemical_list: D002443:Ceftriaxone; D000658:Amoxicillin; D002439:Cefotaxime