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[Elements of pharmacodynamics and pharmacokinetics]
1Service de médecine interne-gérontologie, hôpital Charles-Foix, Ivry-sur-Seine.
La Revue Du Praticien
|May 21, 1990
Summary
Understanding drug pharmacokinetics is crucial for safe medication use, especially in the elderly. Dosage adjustments require more than just half-life, considering kidney and liver function, and potential drug interactions.
Area of Science:
- Pharmacology
- Geriatric Medicine
- Drug Metabolism
Context:
- Elderly individuals consume a significant portion of prescribed medications.
- Accurate pharmacokinetic data is vital for drugs with a narrow safety margin.
- Current understanding of age-related pharmacokinetic and pharmacodynamic changes is limited.
Purpose:
- To highlight the importance of pharmacokinetic data in drug safety and dosing, particularly in the elderly population.
- To discuss the limitations of traditional pharmacokinetic parameters like half-life in geriatric dosing.
- To emphasize the need for better evaluation of age-related changes in drug metabolism and interactions.
Summary:
- Pharmacokinetic investigations and population studies are key to understanding drug behavior.
- Creatinine clearance offers a quantifiable method for dosing renally excreted drugs.
- Hepatic metabolism changes with age and disease are complex and not well understood.
- Drug interactions are common in the elderly due to polypharmacy and altered drug handling.
Impact:
- Improved drug safety and efficacy in the elderly population.
- Development of more precise dosing strategies for geriatric patients.
- Enhanced understanding of age-related physiological changes affecting drug response.
- Reduced incidence of adverse drug events and drug interactions in older adults.