Background: Pharmacokinetics (PK), pharmacodynamics and optimal dosing of vancomycin in obese children
is not known. Higher trough levels of vancomycin may improve outcomes. This prospective study evaluated the
appropriateness of twice-daily regimen for the adherence to guidelines, among obese and non obese children.
Methods: Children receiving vancomycin, (20 mg/kg BID) were included. Patients were divided into 3 groups. Adequacy
was defined as trough level ≥ 10mg/L and AUC/MIC > 400. An alternative-dosing regimen was calculated based on
individual PK parameters.
Results: Seventy-seven pairs (trough, peak) were taken from 51 children. Mean trough level was 3.36±2.58, only 3% fell
in therapeutic range, no statistical difference was observed between obese, normal weight or underweight groups. One
child had an AUC/MIC > 400. All children recovered.
Conclusion: PK properties of all weight groups were similar. More frequent and higher doses are needed to achieve the
goals of current guidelines.