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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...

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 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

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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 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 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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Related Experiment Videos

[Cardiovascular agents in the elderly: main rules to optimize their use].

Patrick Friocourt¹, Joël Belmin

¹Pôle autonomie, neurologie et prise en charge du vieillissement, centre hospitalier, Blois, France. pfriocourt@ch-blois.fr

La Revue Du Praticien

|January 12, 2010

Summary

Cardiovascular drugs are effective but underused in elders due to adverse event fears. Safe prescribing for elderly heart failure requires individualized dosing based on renal function and vital signs.

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Area of Science:

Geriatrics
Cardiology
Pharmacology

Background:

Cardiovascular drugs demonstrate efficacy in treating various heart conditions.
Adverse events associated with cardiovascular medications can be serious in older adults.
Underutilization of key drugs like beta-blockers and ACE inhibitors in elderly heart failure patients is noted.

Purpose of the Study:

To emphasize safe prescribing practices for cardiovascular drugs in the elderly.
To address the underuse of essential cardiovascular medications in older populations.
To highlight the importance of individualized dosing and risk assessment.

Main Methods:

Review of evidence-based medicine for cardiovascular drug prescribing in geriatrics.
Analysis of factors influencing drug efficacy and safety in elderly patients.
Emphasis on dose adjustment based on individual patient parameters.

Main Results:

Cardiovascular drugs, while effective, pose risks of adverse events in the elderly.
Fear of adverse events contributes to the underuse of beta-blockers and ACE inhibitors in heart failure.
Safe prescribing necessitates dose adjustments considering renal function and potential side effects.

Conclusions:

Cardiovascular drug prescribing in the elderly must adhere to evidence-based guidelines.
Individualized dose adjustments are crucial, accounting for creatinine clearance, hydration, blood pressure, and orthostatic hypotension.
Implementing safe practices can improve the appropriate use of cardiovascular medications in older adults.