The invention relates to dry powder formulations for inhalation comprising a combination of an anti-cholinergic, a long-acting beta2-adrenoceptor agonist, and a corticosteroid, their process of preparation and therapeutic uses thereof.本發明係有關於包含抗膽鹼劑、長效β2-腎上腺素受體促效劑、及皮質類固醇之用於吸入的乾粉配方,其製備方法及其治療用途。