Ciprofloxacin is a synthetic third-generation quinolone antibacterial drug with sterilizing activity against most bacteria in the Enterobacteriaceae family, Pseudomonas aeruginosa, Haemophilus influenzae, Catamorax, Legionella, and Leptospira. It can exert bactericidal effect by inhibiting DNA rotase and topoisomerase, which are essential for bacterial DNA replication. It is mainly used for genitourinary tract infections, respiratory tract infections, gastrointestinal tract infections, typhoid fever, bone and joint infections, skin and soft tissue infections, complicated abdominal infections, septicemia and other systemic infections caused by sensitive bacteria, as well as inhalation anthrax, and also for conjunctivitis, keratitis, otitis media, otitis externa, etc.