Related Experiment Videos
Limiting cefotaxime pediatric dosing to adult standards: a pharmacokinetic simulation study
A M Dulaney Lopez1, J C Rodriguez, A M Lopez-Samblas
1Jackson Children's at the University of Miami/Jackson Memorial Medical Center, FL, USA.
Insights
Limiting cefotaxime to 1 gram every 6-8 hours for children over 20kg maintains effective serum concentrations. This approach ensures therapeutic levels comparable to adults, simplifying dosing and potentially reducing costs.
Area of Science:
- Pharmacology
- Pediatric Infectious Diseases
- Clinical Pharmacy
Background:
- Current cefotaxime dosing for pediatric patients >20kg (50 mg/kg q6-8h) exceeds adult recommendations (1g).
- This raises questions about the necessity of higher pediatric doses for achieving therapeutic efficacy.
Purpose of the Study:
- To evaluate if a standardized 1-gram cefotaxime dose for children >20kg achieves serum concentrations and time above the minimum inhibitory concentration (MIC90) comparable to adults.
- To assess the feasibility of dose standardization for pediatric cefotaxime therapy.
Main Methods:
- Simulated cefotaxime serum concentration profiles using published pharmacokinetic parameters for children and adults.
- Employed an open, one-compartment, multiple-dose model within commercial spreadsheet software.
- Calculated time above MIC90 for pediatric pathogens under various dosing scenarios (1g or 50mg/kg q6-8h).
Main Results:
- Pediatric 50 mg/kg regimens (q8h/q6h) yielded higher peak concentrations and AUCs than adults.
- A 1-gram regimen in pediatric simulations also resulted in higher serum concentrations and AUCs compared to adults.
- Time above MIC90 in pediatric simulations met or exceeded adult levels for all tested pathogens.
Conclusions:
- A standardized 1-gram cefotaxime dose every 6 or 8 hours is supported for children >20kg with mild-moderate infections.
- Dose standardization can simplify treatment protocols.
- Standardization may lead to cost reductions by minimizing individualized dose preparation.
Objective:
The recommended cefotaxime dose of 50 mg/kg every six to eight hours for pediatric patients with a body weight greater than 20 kg exceeds the standard 1-gram dose recommended for adult patients. This study estimated whether limiting the cefotaxime dose recommended for children with mild to moderate infections to a standard 1-gram dose would achieve serum concentrations and time above the MIC90 comparable to those in adults.
Methods:
Serum concentration profiles were simulated from mean cefotaxime pharmacokinetic parameters that have been published for children and for adults using widely available spreadsheet software. The simulations employed an open, one-compartment, multiple-dose model and were calculated using a common commercial spreadsheet. The model was used to predict serum concentrations using dosage regimens of 1 g or 50 mg/kg administered every six or eight hours in pediatric patients of various weights with pediatric pharmacokinetic parameters and 1 g every six or eight hours for adult patients with adult pharmacokinetic parameters. The time that cefotaxime concentrations exceeded the MIC90 for pediatric pathogens was also calculated.
Results:
The 50 mg/kg pediatric dosing regimens administered every 8 hours (q8h) or every 6 hours (q6h) consistently produced peak serum concentrations and area under the concentration versus time curve (AUC) values higher than those in adults. Serum concentrations and AUCs generated for the 1-gram regimens for various pediatric weight categories were also above those predicted in adults. The time above the MIC90 for pediatric patients was equivalent to or exceeded those of the adult simulations for all pathogens.
Conclusions:
The results support the concept of limiting cefotaxime dosage regimens to 1 g administered every 6 or 8 hours for mild to moderate infections in children weighing more than 20 kg. This dosage regimen could lead to dose standardization procedures, which could produce reductions in drug costs associated with individualized dosage preparation.