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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...

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 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...

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...

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 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...

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[Clinical pharmacology and aging].

Carmelo Lafuente-Lafuente¹, Elodie Baudry, Elena Paillaud

¹AP-HP, groupe hospitalier Pitié-Salpêtrière-Charles-Foix, pôle de gériatrie Paris Val de Marne, site Charles-Foix, 94205 Ivry-sur-Seine, France. carmelo.lafuente@cfx.aphp.fr

Presse Medicale (Paris, France : 1983)

|January 22, 2013

Summary

Aging significantly alters drug pharmacokinetics and pharmacodynamics, affecting distribution, metabolism, and elimination. Clinicians must adjust drug dosages based on individual patient factors like renal function and nutritional status for optimal outcomes.

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Area of Science:

Gerontology
Pharmacology
Clinical Medicine

Context:

Aging impacts physiological processes, influencing drug behavior in the body.
Changes in body composition and organ function are common in older adults.

Purpose:

To inform clinicians about age-related changes in drug pharmacokinetics and pharmacodynamics.
To emphasize the need for individualized drug therapy in the elderly.

Summary:

Aging alters drug distribution (serum albumin, body composition), hepatic metabolism (reduced blood flow, P450 activity), and renal elimination (increased renal failure, decreased GFR).
Older adults exhibit altered drug responses, particularly affecting the central nervous system, cardiovascular system, and electrolyte balance.
While some age-related drug changes are minor, many necessitate dose adjustments based on renal function and nutritional status; certain drugs should be avoided due to poor efficacy/tolerance.

Impact:

Promotes safer and more effective medication management for geriatric populations.
Highlights the importance of systematic renal function assessment in older patients.
Encourages personalized pharmacotherapy to improve patient outcomes and minimize adverse drug events.