Enprofylline pharmacokinetics in children with asthma

Area of Science:

• Pharmacology and Therapeutics
• Pediatric Asthma Management

Background:

• Enprofylline is a xanthine derivative used in asthma treatment.
• Understanding its pharmacokinetics in children is crucial for effective dosing.

Purpose of the Study:

• To investigate the pharmacokinetics of intravenous enprofylline in pediatric asthma patients.
• To compare pediatric enprofylline pharmacokinetics with adult data.

Main Methods:

• Administered intravenous enprofylline to 8 children with asthma.
• Measured plasma and urine enprofylline levels over time.
• Calculated pharmacokinetic parameters including half-life, volume of distribution, and clearance.

Main Results:

• Mean plasma half-life in children was 1.0 hour, shorter than in adults.
• Urinary excretion rate correlated with plasma half-life, suggesting a non-invasive monitoring method.
• Enprofylline clearance was higher per kg body weight in children but not per m2 body surface area.
• Urinary recovery of unchanged enprofylline was 89%.

Conclusions:

• Pediatric enprofylline dosing should be based on body surface area for accuracy.
• Pharmacokinetic data align with creatinine clearance trends in children.
• Urine excretion offers a viable non-invasive method for assessing enprofylline elimination in children.