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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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...

Drug Dosing: Geriatric Patients

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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...

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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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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...

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Related Experiment Video

Updated: May 21, 2026

Evaluating the Function of the Foot Core System in the Elderly

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Published on: March 11, 2022

Antropometric measurements of elderly.

A R Suriah¹, M Zalifah, M Zainorni

¹Department of Food Science, Faculty of Life Sciences, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor.

Malaysian Journal of Nutrition

|June 14, 2012

Summary

Aging reduces body size and skinfold thickness in elderly individuals. While women had thicker triceps skinfolds, men exhibited larger arm muscle measurements.

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Area of Science:

Gerontology
Human Physiology
Anthropometry

Background:

Understanding age-related changes in body composition is crucial for maintaining health in older adults.
Previous research indicates a general decline in certain anthropometric measures with advanced age.

Purpose of the Study:

To investigate the relationship between age and body composition parameters in free-living elderly individuals.
To compare body composition differences between elderly males and females.

Main Methods:

Anthropometric measurements including height, weight, and skinfold thickness were taken.
Body Mass Index (BMI) was calculated for all participants.
Data was analyzed to identify age- and sex-related trends in body composition.

Main Results:

A significant decrease in height, weight, and BMI was observed with increasing age in both sexes.
Skinfold thickness measurements showed a decline with advancing age.
Elderly females presented with greater tricep skinfold thickness compared to males.
Elderly males had larger mid-arm circumference, mid-arm muscle circumference, and mid-arm muscle area than females.

Conclusions:

Advancing age is associated with reduced body size and subcutaneous fat in the elderly.
Sex differences in body composition persist into old age, with distinct patterns in fat and muscle distribution.