Salmeterol Xinafoate is a selective, long-acting beta-2 agonist used in the treatment of asthma and other forms of diffuse airway obstruction. Fluticasone Propionate is a corticosteroid with mainly glucocorticoid activity. Fluticasone Propionate is stated to exert a topical effect on the lungs without systematic effects at usual dose. Salmeterol protects against symptoms, Fluticasone Propionate improves lung function and prevents exacerbations of the condition. This preparation can offer a more convenient regime for patients on concurrent β-agonist and inhaled corticosteroid therapy. The respective mechanisms of action of both drugs