Objective Assay gatifloxacin in gatifloxacin for injection. Methods RP-HPLC method was applied in assay with C 18 column, with the mobile phase of ψ(acetonitrile: methanol: acetic acid-triethylamine buffer: sodium dodecyl sulfate)=30∶40∶30∶0.25 and detection wavelength of 290 nm. Result Gatifloxacin showed linear correlation in the range of 8.05~161.0 mg/mL (r=0.9996) with recovery of 99.9% and RSD of 0.4%. Conclusion The method is accurate and reliable, and can be used in quality control of gatifloxacin...