Which of the following medications is classified as a bronchodilator?

Bronchodilators are medications that relax the muscles in the airways, which can help to increase airflow into the lungs and improve breathing. Albuterol is a well-known bronchodilator that acts specifically on the beta-2 adrenergic receptors in the lungs. This action leads to the dilation of bronchial passages, making it a common choice in the treatment of conditions like asthma and chronic obstructive pulmonary disease (COPD).

In contrast, the other medications listed serve different purposes. Thioridazine is an antipsychotic used mainly in treating schizophrenia, Trimethoprim is an antibiotic primarily used for bacterial infections, and Nitroglycerin is a vasodilator that is generally used for managing chest pain related to heart conditions. Understanding the specific functions of these medications is essential for their correct usage in patient care.