Penetration and concentration of cefadroxil in sputum, lung and pleural fluid

Area of Science:

• Pharmacology
• Infectious Diseases
• Respiratory Medicine

Background:

• Acute respiratory infections are frequently caused by bacteria such as Staphylococcus aureus, Streptococcus pneumoniae, and Streptococcus pyogenes.
• Understanding antibiotic distribution in relevant tissues is crucial for effective treatment strategies.

Purpose of the Study:

• To evaluate the penetrability and concentration of cefadroxil in sputum, pleural fluid, and lung tissue.
• To determine if cefadroxil concentrations in these tissues are adequate to inhibit common respiratory pathogens.

Main Methods:

• Patients with acute respiratory infections or undergoing thoracic surgery received single doses of cefadroxil (500 mg or 1 g).
• Antibiotic concentrations were measured in serum, sputum, pleural fluid, and lung tissue.
• In vitro susceptibility testing was performed against common respiratory pathogens.

Main Results:

• Cefadroxil concentrations in sputum, pleural fluid, and lung tissue were approximately 50% of serum concentrations but exhibited longer persistence.
• Measured cefadroxil levels in all biological samples were sufficient to inhibit the growth of S. aureus, S. pneumoniae, and S. pyogenes.
• The antibiotic demonstrated good tissue penetration and sustained therapeutic levels.

Conclusions:

• Cefadroxil exhibits favorable pharmacokinetic properties in respiratory tissues.
• The drug's ability to achieve inhibitory concentrations against key pathogens supports its use in treating bacterial respiratory infections.
• Cefadroxil is a potentially valuable therapeutic option for managing respiratory tract infections.