Ampicillin pharmacokinetics in Indian geriatric subjects

Area of Science:

• Pharmacology
• Geriatric Medicine
• Drug Metabolism

Background:

• Ampicillin is a widely used antibiotic.
• Age-related changes in drug metabolism and excretion are common.
• Understanding ampicillin pharmacokinetics in the elderly is crucial for safe and effective treatment.

Purpose of the Study:

• To compare ampicillin elimination in geriatric and younger adult subjects.
• To investigate the impact of aging on ampicillin serum concentration, elimination half-life, plasma clearance, and urinary excretion.

Main Methods:

• A comparative study involving two groups: geriatric subjects and younger adult subjects (10 per group).
• Pharmacokinetic parameters including serum concentration, elimination half-life, plasma clearance, and urinary excretion of ampicillin were measured.
• Correlation between urinary excretion and creatinine clearance was assessed.

Main Results:

• Geriatric subjects demonstrated significantly higher ampicillin serum concentrations and prolonged elimination half-life compared to younger subjects.
• Plasma clearance and urinary excretion of ampicillin were significantly reduced in the geriatric group.
• A significant positive correlation was observed between ampicillin urinary excretion and creatinine clearance in all subjects.

Conclusions:

• Ampicillin elimination is impaired in geriatric individuals, leading to increased drug exposure.
• Reduced renal function, as indicated by creatinine clearance, significantly influences ampicillin excretion in the elderly.
• Dosage adjustments for ampicillin may be necessary in geriatric patients to prevent potential toxicity.