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Related Concept Videos

Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are not...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...

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Related Experiment Video

Updated: Jun 30, 2026

Semi-Targeted Ultra-High-Performance Chromatography Coupled to Mass Spectrometry Analysis of Phenolic Metabolites in Plasma of Elderly Adults
14:39

Semi-Targeted Ultra-High-Performance Chromatography Coupled to Mass Spectrometry Analysis of Phenolic Metabolites in Plasma of Elderly Adults

Published on: April 22, 2022

ADME-tox issues for the elderly.

Sarah N Hilmer1

  • 1Royal North Shore Hospital, Ward 11C Main Building, Pacific Highway, St Leonards NSW 2065, Australia. shilmer@med.usyd.edu.au

Expert Opinion on Drug Metabolism & Toxicology
|September 19, 2008
PubMed
Summary

Older adults experience increased drug toxicity due to changes in how the body processes medications (ADME-tox). Understanding these age-related factors is crucial for safe and effective prescribing in the elderly population.

Area of Science:

  • Gerontology
  • Pharmacology
  • Toxicology

Background:

  • The elderly population (>65 years) is diverse, with aging associated with higher disease prevalence and increased risk of drug toxicity.
  • Age-related physiological changes impact medication pharmacokinetics and pharmacodynamics.

Purpose of the Study:

  • To review scientific and clinical data on absorption, distribution, metabolism, excretion, and toxicity (ADME-tox) in older adults.
  • To inform healthcare providers and drug developers about age-related factors influencing drug dosage, safety, and efficacy.

Main Methods:

  • Comprehensive review of published scientific and clinical literature.
  • Analysis of ADME-tox data specific to the aging population.

Main Results:

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Semi-Targeted Ultra-High-Performance Chromatography Coupled to Mass Spectrometry Analysis of Phenolic Metabolites in Plasma of Elderly Adults
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  • Increased inter-individual variability in drug response and toxicity is a key characteristic of aging.
  • Reduced hepatic and renal clearance are significant toxicokinetic changes in normal aging.
  • Data on ADME-tox changes in frail elderly individuals are less established than in the generally aging population.

Conclusions:

  • Drug toxicity in older adults is multifactorial, influenced by target sensitivity, physiological reserve, and response to injury.
  • Further research is needed on medication effects on cognitive and physical functions in the elderly.
  • Understanding age-related ADME-tox shifts is vital for optimizing geriatric pharmacotherapy.