Description: Ambroxol is a beta-adrenergic agonist drug which stimulates the beta 2 receptors in the lungs. Beta-agonists increase the amount of cyclic AMP (cAMP) in cells, which causes smooth muscle relaxation. Levosalbutamol relaxation of the airway wall increases airflow and decreases mucous secretion. It is used to treat asthma attacks in people who have mild symptoms. relaxation of the airway wall increases airflow and decreases mucous secretion. It is used to treat asthma attacks in people who have mild symptoms.