Drug disposition and hepatotoxicity in the elderly

Area of Science:

• Gerontology
• Pharmacology
• Hepatology

Background:

• The aging process impacts physiological functions, including liver function and drug metabolism.
• Elderly individuals consume significantly more medications, increasing the potential for adverse drug events.
• Understanding age-related changes in the liver is crucial for safe and effective pharmacotherapy in older adults.

Purpose of the Study:

• To evaluate the functional capacity of the aged liver in drug disposition and susceptibility to injury.
• To identify factors contributing to adverse drug effects in the elderly population.
• To assess the impact of aging on hepatic drug metabolism and elimination.

Main Methods:

• Review of existing literature on liver function, drug metabolism, and pharmacokinetics in aging.
• Analysis of factors influencing drug elimination, including hepatic blood flow, liver volume, and protein binding.
• Consideration of non-liver-related factors such as drug-drug interactions and patient frailty.

Main Results:

• The aged liver generally maintains remarkable function, with drug disposition showing selective and modest changes.
• There is limited evidence of increased susceptibility to drug-induced liver injury in healthy aged individuals.
• Adverse drug effects are more frequently associated with drug-drug interactions and comorbidities than intrinsic liver function decline.

Conclusions:

• Hepatic drug elimination in healthy older adults is only modestly impaired, primarily affecting drugs dependent on liver blood flow.
• Frailty, polypharmacy, and comorbidities significantly contribute to drug-related issues in the elderly.
• While the aged liver adapts well, decreased host defense mechanisms may impair recovery from injury.