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 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).