Pharmacokinetics of cefotaxime

Area of Science:

• Pharmacology
• Clinical Pharmacy
• Antibiotic Research

Background:

• Cefotaxime is a cephalosporin antibiotic.
• Understanding cefotaxime pharmacokinetics is crucial for optimizing treatment regimens.
• Comparative analysis of intramuscular and intravenous administration routes is essential.

Purpose of the Study:

• To determine the pharmacokinetics of cefotaxime following intramuscular injection and intravenous infusion.
• To evaluate serum levels, half-life, volume of distribution, and clearance.
• To assess the potential for reduced dosage regimens based on pharmacokinetic and pharmacodynamic properties.

Main Methods:

• Pharmacokinetic analysis of cefotaxime serum concentrations.
• Intramuscular (500 mg and 1,000 mg) and intravenous (1,000 mg over 30 min) administration in human subjects.
• Measurement of peak serum levels, half-life, volume of distribution, serum clearance, and renal clearance.

Main Results:

• Mean peak serum levels for intramuscular cefotaxime were 11.7 mcg/ml (500 mg) and 20.5 mcg/ml (1,000 mg).
• Serum half-life ranged from 1.13 to 1.3 hours; volume of distribution was approximately 32-37 liters.
• Serum clearance was around 315-341 ml/min/m², with renal clearance at 130 ml/min/m² for IV infusion.

Conclusions:

• Cefotaxime exhibits predictable pharmacokinetic profiles for both intramuscular and intravenous routes.
• Pharmacology is comparable to other cephalosporins, but low inhibitory levels suggest potential for dose reduction.
• Further studies are warranted to confirm the efficacy of lower cefotaxime dosage regimens.