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Related Concept Videos

Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

339
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...
339
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

291
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...
291
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

308
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...
308
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

308
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...
308
Drug toxicity: Drug–Drug Interaction01:30

Drug toxicity: Drug–Drug Interaction

223
Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
223
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

787
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...
787

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Diagonal Method to Measure Synergy Among Any Number of Drugs
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Published on: June 21, 2018

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Polytherapy and drug interactions in elderly.

Hima Bindu Gujjarlamudi1

  • 1Department of Pharmacology, Rajiv Gandhi Institute of Medical Sciences, Ongole, Andhra Pradesh, India.

Journal of Mid-Life Health
|October 11, 2016
PubMed
Summary

As people age, they often take more medications, increasing the risk of harmful drug interactions. Regular review of medication regimens and awareness of supplements are crucial for safe polytherapy in older adults.

Keywords:
Drug interactionspharmacodynamicspharmacokineticspolytherapy

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Last Updated: Mar 13, 2026

Diagonal Method to Measure Synergy Among Any Number of Drugs
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Area of Science:

  • Gerontology and Geriatric Medicine
  • Clinical Pharmacology
  • Integrative Medicine

Background:

  • The aging population (individuals over 65) is growing, leading to increased disease prevalence and polypharmacy.
  • Physiological changes in older adults alter drug pharmacokinetics and pharmacodynamics, affecting drug response.
  • The risk of drug-drug interactions and adverse drug events escalates with the number of medications used.

Approach:

  • This article reviews pharmacokinetic, pharmacodynamic, and herbal drug interactions relevant to the elderly.
  • It highlights the importance of periodic evaluation of medication regimens to mitigate polytherapy.
  • Emphasis is placed on clinician awareness of potential interactions involving herbal and dietary supplements.

Key Points:

  • Aging modifies drug absorption, distribution, metabolism, and excretion, impacting efficacy and safety.
  • Polypharmacy in the elderly significantly elevates the likelihood of complex drug interactions.
  • Herbal and dietary supplements can pose substantial risks for drug-drug interactions in older patients.

Conclusions:

  • Minimizing polytherapy through periodic medication regimen evaluation is essential for elderly patient safety.
  • Clinicians must proactively assess all substances, including supplements, to prevent adverse drug events.
  • Understanding age-related pharmacokinetic and pharmacodynamic changes is critical for optimizing geriatric pharmacotherapy.