Which of the following is not a type of Long-Acting Muscarinic Antagonist (LAMA)?

Formoterol is not classified as a Long-Acting Muscarinic Antagonist (LAMA). Instead, it belongs to the category of Long-Acting Beta-Agonists (LABA). LAMAs are primarily used in the management of chronic obstructive pulmonary disease (COPD) and asthma by blocking the action of acetylcholine on muscarinic receptors, leading to bronchial dilation. The other options provided—tiotropium, umeclidinium, and aclidinium—are all recognized LAMAs that act in this manner. Tiotropium is widely utilized in clinical practice for its effective bronchodilator properties, while umeclidinium and aclidinium are newer agents that also serve the same purpose. Thus, understanding the classification and mechanism of action for these medications is pivotal in recognizing their appropriate use in respiratory treatment protocols.