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