Which of the following is an example of a bronchodilator?

• A. Albuterol
• B. Sertraline
• C. Penicillin
• D. Lactulose

Answer: (A)

Albuterol is classified as a bronchodilator because it acts primarily on the beta-2 adrenergic receptors in the smooth muscles of the airways, causing relaxation and opening of the bronchial passages. This process helps to alleviate symptoms associated with conditions like asthma and chronic obstructive pulmonary disease (COPD) by improving airflow and reducing respiratory distress.

The other options do not function as bronchodilators. Sertraline is an antidepressant belonging to the selective serotonin reuptake inhibitor (SSRI) class, primarily used to treat conditions such as depression and anxiety. Penicillin is an antibiotic used to treat bacterial infections, and lactulose is a synthetic sugar used primarily to treat constipation and hepatic encephalopathy. Each of these medications serves a completely different therapeutic purpose and mechanism of action compared to albuterol's role in respiratory therapy.