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Chloramphenicol pharmacokinetics in infants and young children
Insights
Monitoring serum chloramphenicol levels is crucial in pediatric patients due to significant pharmacokinetic variability. This study highlights the need for individualized dosing to ensure safe and effective chloramphenicol succinate treatment in children.
Area of Science:
- Pharmacology
- Pediatric Medicine
- Clinical Pharmacy
Background:
- Chloramphenicol succinate is an intravenous formulation of chloramphenicol used in pediatric patients.
- Understanding the pharmacokinetics of chloramphenicol is essential for optimizing its therapeutic use and minimizing toxicity.
Purpose of the Study:
- To measure and analyze serum chloramphenicol concentrations in hospitalized pediatric patients.
- To determine key pharmacokinetic parameters including half-life, volume of distribution, and clearance.
- To assess the variability of these parameters in the pediatric population.
Main Methods:
- Serum samples were collected from 17 pediatric patients (1 month to 6 years) receiving intravenous chloramphenicol succinate.
- Pharmacokinetic parameters (T1/2, Vd, CL) were calculated from measured serum concentrations.
- Two patients underwent repeat measurements to assess changes during hospitalization.
Main Results:
- Serum half-life (T1/2) ranged from 2.1 to 8.3 hours (mean 3.98 hours).
- Apparent volume of distribution (Vd) ranged from 0.78 to 2.09 L/kg (mean 1.39 L/kg).
- Total body clearance (CL) ranged from 0.122 to 0.429 L/kg/hour (mean 0.281 L/kg/hour).
- Increased clearance was observed in two patients upon restudy during their hospitalization.
Conclusions:
- Significant inter-individual variability exists in chloramphenicol pharmacokinetics among pediatric patients.
- The wide range of pharmacokinetic parameters necessitates routine monitoring of serum chloramphenicol concentrations.
- Individualized therapeutic drug monitoring is recommended for safe and effective chloramphenicol succinate therapy in infants and children.
Abstract:
We measured serum chloramphenicol concentrations in 17 hospitalized pediatric patients (aged 1 month to 6 years) after intravenous infusion of chloramphenicol succinate. The serum T1/2 ranged from 2.1 to 8.3 hours with a mean of 3.98 (SD 1.75) hours, while the apparent volume of distribution ranged from 0.78 to 2.09 liters/kg with a mean of 1.39 (SD 0.34) liters/kg. The total body clearance ranged 0.122 to 0.429 liters/kg/hour with a mean of 0.281 (SD 0.117) liters/kg/hour. Two patients were restudied, and had increased clearance during their hospitalization. Because of the wide variability in pharmacokinetics, we conclude that serum chloramphenicol concentrations should be monitored in infants and children.