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Drug Dosing: Geriatric Patients

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 Absorption

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 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...

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

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...

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

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...

Pharmacodynamics in Geriatric Patients: Effects of Age

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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The Motivation for Alcohol Reward: Predictors of Progressive-Ratio Intravenous Alcohol Self-Administration in Humans

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Alcohol intake in a healthy elderly population.

J S Goodwin, C J Sanchez, P Thomas

American Journal of Public Health

|February 1, 1987

Summary

Older adults who consumed alcohol showed no changes in social or psychological status. While some cognitive benefits were observed, these were weak and disappeared when accounting for other factors.

Area of Science:

Gerontology
Neuroscience
Public Health

Background:

Alcohol consumption is common in older adults.
Understanding the impact of alcohol on health in seniors is crucial.
Previous research has yielded mixed results on alcohol's effects in this demographic.

Purpose of the Study:

To investigate the association between alcohol consumption and social, psychological, and cognitive status in healthy older adults.
To determine if alcohol intake correlates with specific health indicators in individuals over 65.
To explore the nuances of alcohol's impact on well-being in the elderly population.

Main Methods:

A study involving 270 healthy, independently living men and women aged 65 and above.
Dietary records were used to assess alcohol intake over a three-day period.

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Social, psychological, and cognitive assessments were conducted.

Main Results:

48% of participants consumed alcohol; 8% drank 30g or more daily.
Alcohol intake was linked to male gender, higher income, more education, and younger age (within the 65+ range).
No significant associations were found with social or psychological status. Weak positive associations with cognitive status diminished after controlling for demographic and socioeconomic factors.

Conclusions:

Alcohol consumption in healthy older adults is not associated with social or psychological decline.
Observed cognitive associations are weak and likely confounded by factors like income and education.
Past alcohol intake does not predict current social, psychological, or cognitive functioning in this age group.