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Related Concept Videos

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

229
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...
229
Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

258
Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
258
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

234
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...
234
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

196
In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
196
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

198
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...
198
Pharmacokinetics in Pediatric Patients: Drug Excretion01:26

Pharmacokinetics in Pediatric Patients: Drug Excretion

214
In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
214

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Related Experiment Video

Updated: Jan 20, 2026

Pharmacokinetics in Pediatric Patients: Drug Excretion
01:26

Pharmacokinetics in Pediatric Patients: Drug Excretion

Published on: October 2, 2025

214

[Changes in pharmacokinetics in elderly patients].

Masayuki Nadai1, Miki Katoh

  • 1Faculty of Pharmacy, Meijo University.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|July 17, 2013
PubMed
Summary

Aging alters drug absorption and distribution, affecting peak plasma levels of hydrophilic drugs and increasing the volume of distribution for lipophilic drugs. Reduced liver and kidney function also impact drug clearance in older adults.

Area of Science:

  • Pharmacology
  • Gerontology
  • Physiology

Context:

  • Physiological and morphological changes occur with aging.
  • These changes can influence how the body processes drugs (drug disposition).
  • Understanding age-related pharmacokinetic variations is crucial for safe and effective medication use in the elderly.

Purpose:

  • To review the impact of aging on drug absorption, distribution, metabolism, and excretion.
  • To highlight how age-related physiological changes affect drug pharmacokinetics.
  • To provide insights into altered drug disposition in the elderly population.

Summary:

  • While drug absorption shows no significant age-related change, altered body composition (increased fat, decreased water) affects drug distribution.
  • Water-soluble drugs exhibit higher peak plasma levels, while lipid-soluble drugs show increased volume of distribution in the elderly.

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  • Age-dependent decreases in serum albumin, liver function (size, blood flow, enzyme activity), and kidney function (blood flow, GFR, tubular secretion) reduce drug clearance.

    • Impact:

    • Altered drug disposition in the elderly necessitates careful consideration of dosing and drug selection.
    • Reduced hepatic and renal clearance can lead to increased drug accumulation and potential toxicity in older patients.
    • This review underscores the importance of age-specific pharmacokinetic considerations in geriatric pharmacotherapy.