Which of the following medications is an example of a beta 2 agonist?

The correct answer, albuterol, is a well-known beta-2 agonist primarily used for its bronchodilator effects in the management of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Beta-2 agonists work by stimulating beta-2 receptors in the bronchial smooth muscle, leading to relaxation and dilation of the airways, which helps to improve airflow and alleviate symptoms of bronchospasm.

Salmeterol, while also a beta-2 agonist, is typically recognized as a long-acting beta-2 adrenergic agonist (LABA) used for maintenance therapy rather than quick relief. Propranolol, on the other hand, is a non-selective beta blocker that inhibits both beta-1 and beta-2 receptors, primarily used for conditions such as hypertension and anxiety, but not for bronchodilation. Ephedrine has mixed actions, including both alpha and beta adrenergic stimulation, and is not exclusively classified as a beta-2 agonist.

In summary, albuterol stands out as a fast-acting medication specifically targeting beta-2 receptors to provide rapid relief from bronchospasm, making it a vital medication in respiratory therapy.