A compound which is a hydroxyquinolihohe derivative of formula (I), in the form of a racemate, a steroisomer or a mixture of stereoisomers, or a pharmaceutically acceptable salt or solvate thereof, for use in normalising the lung function of a human patient.本發明提供一種化合物或其醫藥學上可接受之鹽或溶劑合物,所述化合物為式(I)之羥基喹啉酮衍生物,且呈外消旋體、立體異構體或立體異構體混合物之形式,其用於使人類患者之肺功能正常化。