593727 Disclosed herein is the use of a compound which is 5-(2-{ [6-(2,2-difluoro-2-phenylethoxy) hexyl]amino} -1-hydroxyethyl)-8-hydroxyquinolin-2-(lH)-one in the form of a racemate, a stereoisomer or a mixture of stereoisomers, or a pharmaceutically acceptable salt or solvate thereof, in the manufacture of a medicament for use by inhalation in normalising the lung function of a human patient suffering from asthma, chronic obstructive pulmonary disease (COPD), muscular dystrophia, or gastro oesophageal reflux.