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Related Concept Videos

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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...
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...
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...
Chronic Kidney Disease I: Introduction01:25

Chronic Kidney Disease I: Introduction

Chronic Kidney Disease (CKD) arises when the kidneys progressively lose their ability to function, ultimately leading to end-stage renal disease. At this advanced stage, the kidneys can no longer filter waste or maintain essential body functions, requiring renal replacement therapy (RRT) through dialysis or a kidney transplant for survival.Early-stage chronic kidney disease and detection challengesIn CKD's early stages, symptoms often remain absent because healthy nephrons compensate for...
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...

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Related Experiment Video

Updated: Jul 5, 2026

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney
08:53

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Published on: August 9, 2014

[Old age and the kidneys].

Endre Balázs1, Andrea Ruszwurm, Miklós Székely

  • 1Nagykanizsa Megyei Jogú Város Kórháza Gerontológiai Osztály Nagykanizsa.

Orvosi Hetilap
|April 23, 2008
PubMed
Summary

Aging kidneys undergo significant structural and functional decline, not merely physiological changes. These alterations impact drug pharmacokinetics and increase susceptibility to acute kidney injury in older adults.

Area of Science:

  • Nephrology
  • Gerontology
  • Pathology

Context:

  • Age-related kidney changes are common in the elderly population.
  • Understanding these changes is crucial for geriatric medicine and pharmacology.
  • Kidney function decline is often underestimated as a normal aging process.

Purpose:

  • To detail the non-physiological morphological and functional alterations in aging kidneys.
  • To highlight the impact of these changes on renal excretory functions and drug pharmacokinetics.
  • To discuss the increased risk of chronic and acute renal failure in older individuals.

Summary:

  • Aging kidneys exhibit reduced glomerular number, glomerulosclerosis, and tubular atrophy with interstitial fibrosis.
  • Renal blood flow and glomerular filtration rate (GFR) decrease, while tubular transport disorders affect salt and water excretion.

Related Experiment Videos

Last Updated: Jul 5, 2026

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney
08:53

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Published on: August 9, 2014

  • These age-related renal impairments affect drug metabolism and increase the incidence of renal failure, exacerbated by comorbidities like diabetes and hypertension.

    • Impact:

    • Highlights the pathological nature of age-related kidney decline, necessitating tailored medical interventions.
    • Emphasizes the importance of considering renal function in geriatric pharmacotherapy.
    • Underscores the increased vulnerability of elderly individuals to kidney diseases, including acute kidney injury.