What are bronchodilators?

Answer:
Allergic reactions involving the lungs cause the airways or bronchial tubes to narrow. Bronchodilators cause the smooth muscle lining the airways to relax or dilate. This makes the airways open wider, letting more air pass through them.
First answer by Gale Ency. of Medicine. Last edit by Gale Ency. of Medicine. Contributor trust: 37 [recommend contributor recommended]. Question popularity: 5 [recommend question].