Pharmacokinetics and clinical evaluation of aztreonam in pediatric surgery

Pharmacokinetic and clinical studies on aztreonam (AZT) in pediatric surgery were performed and results obtained are summarized below.1. Plasma and urinary levels of AZT were measured in 6 neonate patients following drip-infusion for 1 hour of AZT (dose of AZT: 20mg/kg). Plasma levels reached their peak (42.3-50.4 /ig/ml) at the end of infusion or in 1 hour thereafter except in case 2. In case 2, plasma level reached its peak (36.6 jug/ml) at 2 hours after the end of infusion. Plasma levels of AZT decreased rapidly after reaching their peaks, and plasma half-lives (T 1/2) were 1.852-.84 hours. Urinary recovery rates were 15.7-65 3%.