A broad-spectrum antimicrobial agent, a derivative of fluoroquinolone, inhibits bacterial DNA-gyrase, breaks down the synthesis of DNA, growth and division of bacteria; causes significant morphological changes (including the cell wall and membranes) and the rapid death of the bacterial cell. It acts bactericidal on gram-negative organisms during rest and division (because it affects not only the DNA-gyrase, but also causes lysis of the cell wall), gram-positive microorganisms - only during the fission period.
Ciprofloxacin acts on gram-negative microorganisms: Escherichia coli, Salmonella spp., Shigella spp., Proteus spp.,(indolpositive and indolotricative), Morganella morganii, Citrobacter spp., Klebsiella spp., Enterobacter spp., Yersinia spp., Vibrio spp., Campylobacter spp., Hafnia alvei, Providencia stuartii, Haemophilus influenzae, Pasteurella multocida, Pseudomonas spp., Gardnerella spp., Legionella pneumophila, Neisseria spp., Moraxella catarrhalis, Acinetobacter spp., Brucella spp., Chlamydia spp., Aeromonas spp., Serratia marcescens, Edwardsiella tarda.
Ciprofloxacin is also sensitive to gram-positive microorganisms: Staphylococcus spp., Streptococcus spp., Corynebacterium diphtheriae, Listeria monocytogenes.
Ciprofloxacin is resistant Ureaplasma urealyticum, Clostridium difficile, Nocardia asteroides.