A Bactericidal of fluoroquinolone group , acts by inhibition of DNA, it is iffective against a wide range of Gram Positive pacteria especialy staphylococcus, and Gram Negative (E coli, salmonella, enterobacter, proteus, klebsiella, actinobacillus pleuropneumonia, Pasteurella, haemophilus, moraxella, pseudomonas, and mycoplasma.