what is a bronchodilator
A bronchodilator is a substance that dilates the bronchi and bronchioles, decreasing resistance in the respiratory airway and increasing airflow to the lungs.Bronchodilators may be endogenous (originating naturally within the body), or they may be medications administered for the treatment of breathing difficulties.They are most useful in obstructive lung diseases, of which asthma and chronic obstructive pulmonary disease are the most common conditions.ome short-acting Î²-agonists (for example salbutamol) are specific to the lungs; they are called Î²2-agonists and can relieve bronchospasms without unwanted cardiac (Î²1) side effects of nonspecific Î²-agonists (for example, ephedrine or epinephrine).