Comparative studies of fleroxacin and ofloxacin in experimental pyelonephritis

Area of Science:

• Pharmacology
• Microbiology
• Infectious Diseases

Background:

• Pyelonephritis is a serious kidney infection often caused by Gram-negative bacteria.
• Quinolone antibiotics are frequently used to treat urinary tract infections, including pyelonephritis.

Purpose of the Study:

• To compare the efficacy of two oral quinolones, fleroxacin and ofloxacin, in a rat model of experimental pyelonephritis.
• To evaluate the impact of these antibiotics on bacterial counts in kidney tissue and urine.

Main Methods:

• Experimental pyelonephritis was induced in rats using Escherichia coli, Klebsiella oxytoca, and Pseudomonas aeruginosa.
• Rats were treated orally with either fleroxacin or ofloxacin.
• Bacterial counts in kidney tissue and urine were assessed and compared to untreated controls.

Main Results:

• Both fleroxacin and ofloxacin significantly reduced bacterial loads in the kidneys and urine compared to controls.
• Fleroxacin exhibited a more potent bacterial killing effect than ofloxacin at equivalent lower dosages.
• The quinolones were effective against all tested bacterial strains: E. coli, K. oxytoca, and P. aeruginosa.

Conclusions:

• Oral fleroxacin and ofloxacin are effective treatments for experimental pyelonephritis in rats.
• Fleroxacin shows promise as a highly effective quinolone antibiotic for pyelonephritis, particularly at lower therapeutic doses.