Advair Diskus is a prescribed medication for asthma patients to be inhaled to decrease asthma symptoms. Asthma is a chronic lung disease that inflames and narrows the airways causing wheezing, shortness of breath and persistent bouts of coughing. Advair Diskus contains Fluticasone and salmeterol. Fluticasone is a steroid that helps to prevent inflammation. Salmeterol is a bronchodilat..