Bronchodilator drugs are often used to prevent or relieve wheezing and shortness of breath caused by disorders such as asthma. In these conditions, the bronchi (airways in the lungs) become abnormally narrowed because muscles in their walls contract. Bronchodilators work by widening the airways and thereby increasing the air flow.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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