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Caffeine disposition after oral doses

M Bonati, R Latini, F Galletti

    Clinical Pharmacology and Therapeutics
    |July 1, 1982
    PubMed
    Summary
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    Caffeine disposition was investigated across various doses and beverages. Results show caffeine exhibits dose-independent kinetics in healthy adults at typical consumption levels.

    Area of Science:

    • Pharmacokinetics
    • Human Metabolism
    • Analytical Chemistry

    Background:

    • Caffeine is a widely consumed psychoactive substance.
    • Understanding caffeine's metabolic fate is crucial for health and safety.
    • Previous studies have provided insights into caffeine metabolism, but further details on its disposition across different consumption forms are needed.

    Purpose of the Study:

    • To investigate the pharmacokinetic disposition of caffeine (TMX) in humans.
    • To analyze caffeine and its metabolites in plasma and urine.
    • To compare different analytical methods for pharmacokinetic parameter calculation.

    Main Methods:

    • Administered caffeine at doses of 1, 5, and 10 mg/kg in water, as mocha coffee (1.54 mg/kg), and as a soft drink (0.22 mg/kg).

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  • Analyzed caffeine and its metabolites in plasma and urine using high-pressure liquid chromatography (HPLC).
  • Utilized an analog-digital hybrid computing system to model caffeine and metabolite kinetics in plasma.

    • Main Results:

    • Identified paraxanthine (1,7-dimethylxanthine) as the primary dimethylxanthine metabolite in plasma.
    • Confirmed the consistency of pharmacokinetic parameters (absorption and elimination rate constants, renal clearance) across different analytical methods.
    • Developed a kinetic model describing caffeine and its dimethylated metabolites in plasma.

    Conclusions:

    • Caffeine disposition was comprehensively profiled in healthy adults.
    • Caffeine exhibits dose-independent kinetics at commonly consumed levels.
    • The study provides valuable data on caffeine's metabolic pathways and pharmacokinetic behavior.