ABSTRACT The invention relates to the field of medicine, in particular to the field of veterinary medi cine. The invention relates to glucocorticoids, especially ciclesonide or a pharmaceutically acceptable derivative thereof, for the treatment of airway disease in horses, such as pulmo nary disease, preferably recurrent airway obstruction (RAO), Summer Pasture Associated Obstructive Pulmonary disease (SPAOPD), and inflammatory airway disease (IAD).