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a substance that acts to dilate constricted bronchial tubes to aid breathing, used especially for relief of asthma. bronchodilator.
COPD Overview. Chronic Obstructive Pulmonary Disease (COPD) is the name for a group of conditions that occur because the lungs and airways have been damaged. Individuals with COPD have trouble breathing, and many have emphysema or a combination of asthma and chronic bronchitis.ong-acting bronchodilators are medications that are used to treat COPD over a longer period of time. They are usually taken once or twice daily over an extended period, and they come as inhalers or nebulizers. The long-acting bronchodilators are: 1  tiotropium (Spiriva). 2  salmeterol (Serevent).