Once-daily gentamicin dosing in newborn infants

Area of Science:

• Neonatal pharmacology
• Pediatric infectious diseases
• Clinical pharmacy

Background:

• Gentamicin is a crucial antibiotic for treating neonatal infections.
• Traditional dosing regimens often involve divided daily doses, potentially leading to suboptimal serum drug levels.
• A simplified dosing protocol could improve therapeutic outcomes and reduce toxicity.

Purpose of the Study:

• To evaluate a simplified gentamicin dosing protocol (loading dose followed by once-daily dosing) in neonates.
• To compare the effectiveness and toxicity of the new protocol against a traditional divided-dose regimen.
• To determine if the new protocol achieves therapeutic serum drug levels (SDL) with reduced toxicity.

Main Methods:

• A comparative cohort study involving neonatal intensive care unit patients.
• Prospective data collection for the new gentamicin protocol (132 courses) and retrospective data for the control group (103 courses).
• Tracking of peak and trough serum drug levels, demographic data, and markers of nephrotoxicity, ototoxicity, and cure.

Main Results:

• Term neonates on the new protocol had higher peak and lower trough SDL compared to controls, with 100% achieving target ranges.
• Low birth weight neonates showed similar SDL between groups.
• Very low birth weight neonates on the new protocol had higher initial trough SDL, with a lower incidence in the target range.

Conclusions:

• The simplified gentamicin protocol (loading dose + once-daily) achieved safe and therapeutic SDL in term neonates.
• The regimen showed similar SDL to controls in low birth weight neonates.
• Adjusting maintenance dosing timing may improve trough SDL in very low birth weight neonates.