– Clorprenaline is a β-adrenergic receptor agonist that activates adenylate cyclase and PKA and upregulates cAMP, leading to relaxation of bronchial smooth muscle cells, dilation of the airway, and improvement of airflow. Clorprenaline inhibits the release of mediators, such as histamine and leukotrienes, from mast cells, further promoting its anti-inflammatory properties.