Seretide Accuhaler (50 mcg / 250 mcg) is a dry powder inhaler used for the treatment and management of asthma and chronic obstructive pulmonary disease (COPD). It contains two active ingredients:Salmeterol (50 mcg) - A long-acting beta-agonist (LABA) that helps relax the muscles of the airways, making it easier to breathe. It helps prevent asthma attacks or flare-ups of COPD by opening up the airways over a long period of time.Fluticasone propionate (250 mcg) - A corticosteroid that works by reducing inflammation in the airways. This helps prevent asthma attacks and helps with chronic symptoms of COPD.