Serevent Diskus is a bronchodilator. It is available as salmeterol in generic form. Serevent Diskus belongs to a class of drugs, adrenergic bronchodilators. It treats exercise-induced bronchospasm or asthma attacks. Serevent Diskus also treats COPD, chronic obstructive pulmonary disease including chronic bronchitis and emphysema. It acts by relaxing airway muscles to enhance breathing.