Standard gentamicin dosage regimen in neonates

Area of Science:

• Neonatal Pharmacology
• Pediatric Infectious Diseases
• Clinical Pharmacy

Background:

• Previous gentamicin dosing regimens in neonates with gestational age (GA) of ≥30 weeks resulted in high trough serum concentrations (>2 microg/mL).
• These high trough levels indicate potential for sub-therapeutic efficacy or increased toxicity.

Purpose of the Study:

• To evaluate a revised gentamicin dosage protocol of 3.5 mg/kg every 24 hours in neonates with GA ≥30 weeks.
• To determine if the new regimen reduces the frequency of high trough gentamicin concentrations compared to previous practices.

Main Methods:

• A baseline group received standard gentamicin (2.5 mg/kg IV every 12, 18, or 24 hours).
• A protocol group received the revised gentamicin dose (3.5 mg/kg IV every 24 hours).
• Trough and peak gentamicin concentrations were measured, and renal impairment was monitored.

Main Results:

• The protocol group showed significantly lower trough gentamicin concentrations (4% vs. 33% high troughs) compared to the baseline group.
• The revised regimen resulted in significantly higher peak gentamicin concentrations.
• No patients in either group developed renal impairment.

Conclusions:

• A gentamicin dosage of 3.5 mg/kg every 24 hours is effective in reducing high trough concentrations in neonates (GA ≥30 weeks).
• This optimized regimen achieves higher peak levels while maintaining safety, with no observed renal toxicity.
• The new protocol offers an improved approach to gentamicin dosing in this neonatal population.