Serum and sputum levels of cefaclor

Area of Science:

• Pharmacology
• Microbiology

Background:

• Cefaclor and cephalexin are cephalosporin antibiotics.
• Understanding their pharmacokinetic profiles is crucial for effective treatment of bacterial infections.

Purpose of the Study:

• To compare the pharmacokinetic profiles of cefaclor and cephalexin in healthy volunteers.
• To evaluate cefaclor's sputum penetration and potential efficacy in respiratory tract infections.

Main Methods:

• A cross-over study in 10 healthy adults comparing 1g oral doses of cefaclor and cephalexin.
• Measurement of serum levels, pharmacokinetic constants, and urine recovery for both drugs.
• Assessment of sputum levels in 15 patients with respiratory infections treated with cefaclor.

Main Results:

• Cefaclor exhibited faster initial serum rise and higher levels within 60 minutes compared to cephalexin.
• Cephalexin showed higher serum concentrations at 2 hours, with a greater area under the curve.
• Cefaclor demonstrated adequate sputum penetration, with levels of 0.44-0.54 µg/mL after repeated dosing.

Conclusions:

• Cefaclor and cephalexin have comparable absorption rates.
• Cefaclor's pharmacokinetic profile and sputum levels suggest its efficacy in treating respiratory tract infections caused by sensitive bacteria.