Used as an active pharmaceutical ingredient in inhaled corticosteroids for the management of asthma and chronic obstructive pulmonary disease (COPD). It acts locally in the lungs to reduce inflammation, decrease airway hyperresponsiveness, and prevent bronchoconstriction. Due to its high topical potency and low systemic bioavailability, it is effective at low doses with minimal side effects. Commonly formulated in dry powder inhalers or nasal sprays for respiratory and allergic conditions.