A drug which narrows the bronchi.
Substance that causes contraction of the smooth muscle walls of bronchi, leading to constriction or narrowing of the opening (lumen). Symptoms (e.g., wheezing, shortness of breath) and abnormalities in lung function tests may result. A bronchodilator has the opposite effect (dilates the airways).
A drug that causes narrowing of the air passages by producing spasm of bronchial smooth muscle.
A bronchoconstrictor is a substance that induces the narrowing of the airways. During an allergic reaction, bronchoconstrictors like histamine can be released, potentially triggering an asthma attack. The effect of bronchoconstriction can be counteracted by the administration of a bronchodilator medication.