Salmeterol is a long-acting bronchodilator used to treat respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It works by relaxing the muscles in the airways, making it easier to breathe. Salmeterol is typically used in combination with other medications to provide better control of symptoms. This medication is usually administered through an inhaler, allowing it to act directly in the lungs. It is important to note that Salmeterol is not intended for immediate relief of acute asthma attacks; instead, it is used for ongoing management of symptoms.