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Age-related changes in hepatic function. Implications for drug therapy.

K Woodhouse1, H A Wynne

  • 1University Department of Geriatric Medicine, University of Wales College of Medicine, Cardiff.

Drugs & Aging
|May 1, 1992
PubMed
Summary
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Aging reduces how the liver processes drugs, mainly due to decreased liver size and blood flow. While some drug-metabolizing enzymes might be affected, especially in men, overall liver function tests remain stable.

Area of Science:

  • Pharmacology
  • Gerontology
  • Hepatology

Background:

  • Age-related decline in drug clearance is documented.
  • Proposed mechanisms include reduced liver volume, blood flow, and enzyme activity.
  • Standard liver function tests generally remain unchanged with aging.

Purpose of the Study:

  • To review evidence for age-related changes in hepatic drug metabolism.
  • To identify key factors contributing to reduced drug clearance in older adults.
  • To assess the impact of aging on drug-metabolizing enzymes.

Main Methods:

  • Review of existing literature on drug metabolism and aging.
  • Analysis of studies on liver volume, hepatic blood flow, and liver histology in aging.
  • Examination of in vitro and in vivo data on drug-metabolizing enzyme activity in elderly populations.

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Main Results:

  • Reduced liver volume and hepatic blood flow correlate with decreased clearance of capacity- and flow-limited drugs.
  • Age-related histological liver changes are minor and their significance is unclear.
  • No direct evidence of a generalized fall in hepatic drug-metabolizing enzymes in vitro; some in vivo studies suggest specific cytochrome P450 isoenzymes may be affected, particularly in men.

Conclusions:

  • Age-related decreases in liver size and blood flow are primary drivers of reduced drug clearance.
  • Specific drug-metabolizing enzymes, like certain cytochrome P450 isoenzymes, may be impacted by aging.
  • Further research is needed to fully understand the impact of aging on drug metabolism and response.