Drugs to prevent or treat asthma are often inhaled. Inhaled drugs reach the lungs quickly and have few side effects because only a small amount of drug enters the circulation. A metered-dose inhaler delivers a precise dose when the inhaler is pressed. A spacer can be used to hold the dose before it is inhaled. For treatment of a severe asthma attack, a nebulizer, which enables the delivery of large drug doses, may be used. Different devices are available for children (see Giving inhaled drugs to children).
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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