Seretide Evohaler 50mcg is a maintenance therapy for asthma and COPD. It contains a combination of fluticasone, a corticosteroid that reduces inflammation, and salmeterol, a long-acting beta agonist that helps relax the muscles of the airways. Fluticasone works by reducing swelling and irritation in the airways, while salmeterol helps to open the airways in the lungs. This medication is not for acute symptom relief but aims to prevent asthma attacks and COPD exacerbations. It is crucial to use Seretide Evohaler regularly as prescribed by a healthcare provider to control symptoms and improve lung function.