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Pharmacokinetics of cefoxitin in patients with pleural effusion on a multiple dosage regimen
Abstract:
The pharmacokinetics of cefoxitin were studied in 6 healthy volunteers and in 5 patients with pleural effusion of varied etiologies. The antibiotic was administered in a multiple dosage regimen of 30 mg/kg every 8 hours. Cefoxitin concentrations in serum and pleural fluid were determined after administration of the third dose corresponding to the levels of steady-state in both fluids. The elimination half-life of the antibiotic from the pleural fluid comes to 3.51 +/- 1.15 h, which is significantly greater than the serum half-life, (t 1/2 = 1.42 +/- 0.51 h). This kind of multiple dosage regimen ensures therapeutic levels of cefoxitin in the pleural fluid during the entire treatment.
Insights
This study found that cefoxitin has a longer elimination half-life in pleural fluid (3.51 h) compared to serum (1.42 h) in patients with pleural effusion. Multiple dosing ensures therapeutic cefoxitin levels in pleural fluid.
Area of Science:
- Pharmacology
- Infectious Diseases
- Critical Care Medicine
Background:
- Pleural effusion management often requires effective antibiotic penetration into the pleural space.
- Understanding cefoxitin pharmacokinetics in pleural fluid is crucial for optimizing treatment of associated infections.
Purpose of the Study:
- To investigate the pharmacokinetic profile of cefoxitin in serum and pleural fluid.
- To determine the elimination half-life of cefoxitin in patients with pleural effusion.
Main Methods:
- Pharmacokinetic study involving 6 healthy volunteers and 5 patients with pleural effusion.
- Multiple dosage regimen of cefoxitin (30 mg/kg every 8 hours).
- Measurement of cefoxitin concentrations in serum and pleural fluid at steady-state.
Main Results:
- The elimination half-life of cefoxitin in pleural fluid was significantly longer (3.51 ± 1.15 h) than in serum (1.42 ± 0.51 h).
- Steady-state concentrations were achieved in both serum and pleural fluid.
Conclusions:
- The extended cefoxitin half-life in pleural fluid suggests sustained therapeutic concentrations.
- The studied multiple dosage regimen is effective in maintaining adequate cefoxitin levels in pleural fluid for infection treatment.