What is the fast-acting medication suitable for acute bronchospasm?

Albuterol is a fast-acting bronchodilator that is widely used for the immediate relief of acute bronchospasm, commonly associated with asthma and chronic obstructive pulmonary disease (COPD). It works by relaxing the muscles of the airways, leading to an opening of the bronchial passages and allowing for improved airflow and easier breathing. The onset of action is typically within minutes, making it particularly effective in emergency situations or during asthma attacks.

In contrast, the other medications listed have different mechanisms and uses. Tiotropium bromide is a long-acting anticholinergic medication that is used for maintenance therapy in COPD and asthma but does not provide rapid relief. Dexamethasone is a corticosteroid used to reduce inflammation and suppress the immune response, and while it is important in managing chronic respiratory conditions, it does not act quickly enough to treat acute symptoms. Salmeterol is another long-acting bronchodilator that is intended for ongoing control in asthma and COPD and, similar to Tiotropium, is not used for immediate relief of symptoms.

Thus, albuterol is the most appropriate choice for treating acute bronchospasm due to its rapid action and efficacy.