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[Cephalexin pharmacokinetics]

V G Koroleva, V K Vasil'ev, V I Danilova

    Antibiotiki
    |March 1, 1981
    PubMed
    Summary

    Cephalexin monohydrate absorption is faster in rats than dogs, with similar half-lives. This antibiotic concentrates in kidneys and liver, with 98.8% excreted renally within 24 hours.

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    Area of Science:

    • Pharmacology
    • Veterinary Medicine
    • Drug Metabolism

    Background:

    • Cephalexin monohydrate is a widely used antibiotic.
    • Understanding its pharmacokinetic profile in different species is crucial for effective therapeutic use.
    • Rats and dogs are common models for preclinical drug studies.

    Purpose of the Study:

    • To investigate and compare the pharmacokinetics of orally administered cephalexin monohydrate in rats and dogs.
    • To determine key pharmacokinetic parameters such as absorption rate, maximum concentration, and half-life.
    • To identify tissue distribution and primary excretion routes of cephalexin.

    Main Methods:

    • Single oral dose administration of cephalexin monohydrate to rats and dogs.
    • Pharmacokinetic data analysis using a one-compartmental model.
    • Measurement of drug concentrations in blood, tissues, and excreta over time.

    Main Results:

    • Cephalexin monohydrate exhibited a higher absorption rate in rats compared to dogs.
    • The half-absorption period was 0.2 hours in rats and 0.64 hours in dogs.
    • The time to reach maximum concentration was 1.1 hours in rats and 1.9 hours in dogs.
    • Cephalexin showed selective localization in kidney and liver tissues.
    • Renal excretion was the primary route, accounting for 98.8% of the dose within 24 hours.
    • The elimination half-life was comparable between rats and dogs.

    Conclusions:

    • Oral administration of cephalexin monohydrate results in species-specific absorption rates in rats and dogs.
    • The kidney is the main organ for cephalexin excretion.
    • Selective accumulation in the kidney and liver suggests potential therapeutic efficacy and warrants further investigation.

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