Which type of drug is Tiotropium?

Tiotropium is classified as a long-acting muscarinic antagonist (LAMA). It works by inhibiting the action of acetylcholine at muscarinic receptors in the lungs, leading to bronchodilation. This mechanism is particularly beneficial in the management of chronic obstructive pulmonary disease (COPD) and asthma, as it helps to improve airflow by relaxing the smooth muscles in the airways over an extended period. Unlike short-acting muscarinic antagonists, which are designed for quick relief, Tiotropium is formulated for once-daily dosing, providing sustained effects that help control symptoms throughout the day.

The other options represent different classes of drugs that do not match the pharmacological profile of Tiotropium. Short-acting muscarinic antagonists, for example, would be used for more immediate relief of acute bronchospasm but do not offer the long-duration of action that Tiotropium does. Beta agonists would work through a different mechanism, primarily stimulating beta-adrenergic receptors to induce bronchodilation, while cholinesterase inhibitors are used to increase acetylcholine levels and are not indicated for respiratory indications like Tiotropium.