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Differential pharmacokinetics of digoxin in elderly patients

C G Hanratty1, P McGlinchey, G D Johnston

  • 1Department of Therapeutics and Pharmacology, Queen's University of Belfast, Northern Ireland. c.hanratty@net.ntl.com

Drugs & Aging
|February 24, 2001
PubMed

Insights

Older adults frequently use digoxin for heart conditions, but are at higher risk for toxicity due to age-related changes and drug interactions. Understanding digoxin pharmacokinetics in the elderly is crucial for preventing adverse events.

Area of Science:

  • Pharmacology
  • Geriatrics
  • Cardiology

Background:

  • Digoxin is a common cardiac medication prescribed for atrial fibrillation and heart failure.
  • These conditions are more prevalent in the aging population, leading to increased digoxin use in older adults.
  • Older patients are more susceptible to digoxin toxicity, which can be challenging to diagnose.

Purpose of the Study:

  • To review the pharmacokinetics of digoxin.
  • To examine age-related changes in digoxin pharmacokinetics.
  • To explore how disease states and drug interactions affect digoxin pharmacokinetics in the elderly.

Main Methods:

  • Literature review of digoxin pharmacokinetics.
  • Analysis of age-related physiological changes impacting drug metabolism and excretion.
  • Examination of drug-drug and drug-disease interactions relevant to digoxin in older adults.

Main Results:

  • Aging alters renal function and body composition, affecting digoxin distribution and elimination.
  • Polypharmacy and specific disease states (e.g., renal impairment) increase the risk of digoxin toxicity in the elderly.
  • Understanding these pharmacokinetic changes is key to safe digoxin prescribing.

Conclusions:

  • Age-related pharmacokinetic alterations necessitate careful digoxin dosing in older patients.
  • Preventing digoxin toxicity in the elderly requires a thorough understanding of individual patient factors and potential interactions.
  • Reducing digoxin toxicity will improve outcomes and decrease mortality in the geriatric population.

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