tiotropium + salmeterol

Tiotropium + salmeterol is a fixed-dose combination of two long-acting bronchodilators used in the management of chronic obstructive pulmonary disease (COPD). Tiotropium is a long-acting muscarinic antagonist (LAMA) that works by blocking muscarinic acetylcholine receptors, particularly the M3 subtype, leading to relaxation of airway smooth muscle and bronchodilation. Salmeterol is a long-acting beta-2 adrenergic receptor agonist (LABA) that stimulates beta-2 receptors in bronchial smooth muscle, resulting in bronchodilation. The combination provides additive or synergistic effects on improving airflow obstruction and reducing symptoms such as dyspnea compared to monotherapy with either agent alone. This combination is primarily indicated for maintenance treatment of COPD[3][5][8].