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Theophylline pharmacokinetics in normal elderly subjects.
1Clinical Research Center, Northwestern Memorial Hospital, Chicago, Ill.
Clinical Pharmacology and Therapeutics
|November 1, 1988
Summary
Elderly individuals exhibit reduced theophylline clearance due to decreased renal and metabolic activity. This impacts drug elimination in older adults, highlighting age-related pharmacokinetic changes.
Area of Science:
- Pharmacokinetics
- Geriatric Medicine
- Drug Metabolism
Background:
- Age significantly influences drug pharmacokinetics.
- Theophylline is a common medication whose elimination may be affected by aging.
Purpose of the Study:
- To investigate the impact of age on theophylline kinetics.
- To compare theophylline clearance and metabolism in young and elderly men.
Main Methods:
- Comparative pharmacokinetic study involving young and elderly male subjects.
- Analysis of theophylline volume of distribution, total clearance, unbound fraction, and renal/nonrenal clearance.
- Measurement of urinary metabolites and creatinine clearance.
Main Results:
- No significant age differences in theophylline volume of distribution, total clearance, or half-life.
- Elderly subjects showed a higher unbound theophylline fraction, correlated with lower serum albumin.
- Reduced total unbound theophylline clearance and creatinine clearance in the elderly.
- Decreased unbound renal and metabolic clearance of theophylline and its metabolites in older adults.
Conclusions:
- Renal and metabolic elimination of theophylline are less efficient in normal elderly individuals.
- Age-related decline in clearance mechanisms affects theophylline's pharmacokinetic profile.
- Findings suggest potential need for dose adjustments in elderly patients.