A composition comprising 1- (6-amino-3,5-difluoropyridin-2-yl) -8-chloro-6-fluoro-7- (3-hydroxyazetidin-1-yl) -4-oxo-1,4 acid -dihydroquinolin-3-carboxylic acid or a salt thereof, a crystallization inhibitor selected from the group consisting of hydroxypropylmethylcellulose, polyvinylpyrrolidone and hydroxypropylcellulose and a pH modifier, said composition providing a measurable improvement in the dissolution rate of acid 1- (6 -amino-3,5-difluoropyridin-2-yl) -8-chloro-6-fluoro-7- (3-hydroxyazetidin-1-yl) -4-oxo-1,4-dihydroquinolin-3-carboxylic acid or a salt of the same.Una composición que comprende ácido 1-(6-amino-3,5-difluoropiridin-2-il)-8-cloro-6-fluoro-7-(3-hidroxiazetidin-1-il)-4-oxo-1,4-dihidroquinolin-3-carboxílico o una sal del mismo, un inhibidor de la cristalización seleccionado delgrupo que consiste en hidroxipropilmetilcelulosa, polivinilpirrolidona e hidroxipropilcelulosa y un modificador del pH,proporcionando dicha composición una mejora medible en la velocidad de disolución del ácido 1-(6-amino-3,5-difluoropiridin-2-il)-8-cloro-6-fluoro-7-(3-hidroxiazetidin-1-il)-4-oxo-1,4-dihidroquinolin-3-carboxílico o una sal delmismo.
