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.
Some bronchodilators are inhaled, using a nebulizer or an inhalation aerosol. Others are taken as injections or by mouth. Most are available only by prescription, but a few, such as ephedrine, can be...
bronchodilators: the herbal remedies ephedra (Ephedra sinica, also known as ma Huang in traditional Chinese medicine), khellin (Ammi visnaga ) and cramp bark (Viburnum opulus ) are believed to help...