Final answer:
Serevent (salmeterol) is a medication used for long-term treatment and prevention of asthma and COPD symptoms by relaxing airway muscles.
Step-by-step explanation:
Serevent (salmeterol) is used for the treatment and prevention of breathing problems such as asthma and chronic obstructive pulmonary disease (COPD). It is a long-acting beta-agonist (LABA) that works by relaxing the muscles in the airways to improve breathing. Serevent is not a rescue medication for sudden asthma attacks but is instead used on a regular basis for long-term control of symptoms of asthma and COPD.