Aqueous liquid preparations containing gatifloxacin (chemical name: (+/-)-1-cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-(3-methyl-1-piper azinyl)-4-oxo-quinolinecarboxylic acid) or its salt and sodium edetate； and a method for enhancing the corneal permeability of gatifloxacin, a method for preventing crystallization of gatifloxacin and a method for preventing coloration of gatifloxacin each by blending gatifloxacin or its salt with sodium edetate.
