Effect of endotoxin on gentamicin pharmacokinetics in old and young adult rats

Musbah O.M. Tanira*, B. H. Ali, A. K. Bashir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The effect of endotoxin administration on gentamicin pharmacokinetics in young adult (2-3 months) and old (22-24 months) rats was studied. Gentamicin (3 mg/kg, iv) was administered 24 hours after an endotoxin challenge (5 mg/kg, ip). Some blood biochemical parameters, viz. urea, AST, GGT activities in addition to PCV and Hb concentration and creatinine clearance were also measured. In young animals, endotoxin caused prolongation in gentamicin half life (t( 1/4 )), increased area under the plasma concentration-time curve (AUC) and reduced total body clearance (Cl(B)) and volume of distribution (V(d)). Endotoxin effects in the old rats were qualitatively similar to those induced in the young but were more pronounced. They included more than 10 fold increase in the t( 1/4 ) and AUC. In addition, a rising early phase in gentamicin plasma concentration was noticed in old rats treated with endotoxin which was, probably, due to an early redistribution process of gentamicin. The results indicate that aging and endotoxin, individually, can significantly alter gentamicin pharmacokinetics in the rat. These alterations were exacerbated when endotoxemia was induced in old rats.

Original languageEnglish
Pages (from-to)413-424
Number of pages12
JournalLife Sciences
Issue number6
Publication statusPublished - Jan 3 1997


  • aging
  • endotoxin
  • gentamicin
  • pharmacokinetics

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


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