Gatifloxacin (sesquihydrate) (Standard) is the analytical standard of Gatifloxacin (sesquihydrate). This product is intended for research and analytical applications. Gatifloxacin sesquihydrate (AM-1155, BMS-206584, PD135432) is a potent fluoroquinolone antibiotic with broad-spectrum antibacterial activity. Gatifloxacin sesquihydrate inhibits bacterial type II topoisomerases (IC50=13.8 µg/ml for S. aureus topoisomerase IV) and E. coli DNA gyrase (IC50 = 0.109 µg/ml)[1]. Gatifloxacin sesquihydrate can be used to treat bacterial conjunctivitis?in vivo.