Biochem/physiol Actions Inhibits bacterial DNA gyrase (topoisomerase II) and/or topoisomerase IV. Used to modulate (inhibit) bacterial DNA gyrase-dependent processes such as DNA polymerization, (ATP-dependent) DNA supercoiling, and chromosome fragmentation. Other Notes Antibacterial agents against respiratory tract infections2 Application Sparfoxacin is a fluoroquinolone antibiotic used to study antimicrobial activity against mycobacteria and respiratory tract infections 1.