Cited by 259Coffee research and impactsPharmacogenetics and Drug MetabolismAlcohol Consumption and Health Effects

Pharmacokinetics and metabolism of natural methylxanthines in animal and man

Arnaud, Maurice J.·2011·Handbook of experimental pharmacology

Abstract

Caffeine, theophylline, theobromine, and paraxanthine administered to animals and humans distribute in all body fluids and cross all biological membranes. They do not accumulate in organs or tissues and are extensively metabolized by the liver, with less than 2% of caffeine administered excreted unchanged in human urine. Dose-independent and dose-dependent pharmacokinetics of caffeine and other dimethylxanthines may be observed and explained by saturation of metabolic pathways and impaired elimination due to the immaturity of hepatic enzyme and liver diseases. While gender and menstrual cycle have little effect on their elimination, decreased clearance is seen in women using oral contraceptives and during pregnancy. Obesity, physical exercise, diseases, and particularly smoking and the interactions of drugs affect their elimination owing to either stimulation or inhibition of CYP1A2. Their metabolic pathways exhibit important quantitative and qualitative differences in animal species and man. Chronic ingestion or restriction of caffeine intake in man has a small effect on their disposition, but dietary constituents, including broccoli and herbal tea, as well as alcohol were shown to modify their plasma pharmacokinetics. Using molar ratios of metabolites in plasma and/or urine, phenotyping of various enzyme activities, such as cytochrome monooxygenases, N-acetylation, 8-hydroxylation, and xanthine oxidase, has become a valuable tool to identify polymorphisms and to understand individual variations and potential associations with health risks in epidemiological surveys.

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Crossref · 10.1007/978-3-642-13443-2_3

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  • Absorption of caffeine by the small intestine does not seem to vary by sex, genetic background, environmental factors, or other variables.

    “Absorption by the small intestine does not seem to vary by sex, genetic background, environmental factors, or other variables (46), although specific studies are still needed to confirm this premise.”

    From The Safety of Ingested Caffeine: A Comprehensive Review (2017) · cites this paper as [46]

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Authors
Arnaud, M. J.
Corresponding author
Arnaud, Maurice J.
Venue
Handbook of experimental pharmacology
Published
2010-08-19
Issue
200
Pages
33-91
ISSN
  • 0171-2004 (ISSN-L)
  • 1865-0325
OpenAlex
W135619738
Cited by
259
References
310
Citations by year
2026: 10 · 2025: 20 · 2024: 26 · 2023: 24 · 2022: 18 · 2021: 21 · 2020: 26 · 2019: 20 · 2018: 13 · 2017: 16 · 2016: 9 · 2015: 12 · 2014: 13 · 2013: 8 · 2012: 13
FWCI
39.30
Type
book chapter
Language
en
Open access
closed
Locations
  • Handbook of experimental pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Coffee research and impacts
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Alcohol Consumption and Health Effects
Keywords
methylxanthines, caffeine, theophylline, theobromine, paraxanthine, pharmacokinetics, drug metabolism, hepatic metabolism, CYP1A2, enzyme polymorphism, oral contraceptives, pregnancy, smoking, obesity, diet effects, alcohol, xanthine oxidase, N-acetylation, cytochrome P450, species differences, drug interactions
MeSH terms
Animals, Caffeine, Female, Humans, Male, Theobromine, Theophylline, Tissue Distribution, Xanthines, Metabolic Networks and Pathways

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