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a substance that acts to dilate constricted bronchial tubes to aid breathing, used especially for relief of asthma. bronchodilator.
Short-acting bronchodilators are used as a quick relief or rescue medication, while long-acting bronchodilators can be used every day to control asthma -- in conjunction with an inhaled steroid. For treating asthma symptoms, there are three types of bronchodilators: beta-agonists, anticholinergics, and theophylline. These bronchodilators are available in inhaled, tablet, liquid, and injectable forms, but the preferred method of taking the beta-agonists and anticholinergics is by inhalation.