What is a long-acting bronchodilator that is commonly used?

A long-acting bronchodilator is designed to provide sustained relief from bronchoconstriction, making it suitable for chronic respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Tiotropium bromide is a long-acting muscarinic antagonist (LAMA) that works by inhibiting the action of acetylcholine on muscarinic receptors, leading to dilation of the airways and prolonged bronchodilation. Its effects typically last for 24 hours or more, allowing for once-daily dosing.

In comparison, the other medications listed, while effective, do not fit the criteria of a long-acting bronchodilator in the same way. Albuterol and levosalbutamol are both short-acting beta-agonists (SABAs) that provide quick relief but are not designed for long-term control. Formoterol, while being a long-acting beta-agonist (LABA), is generally used in combination with inhaled corticosteroids for asthma control rather than as a standalone treatment.

Therefore, Tiotropium bromide stands out as the correct example of a long-acting bronchodilator commonly used in the management of respiratory conditions.