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    Effect of β-agonists

    Bronchospasm is relieved by β-agonists, and also can be prevented when β-agonists are inhaled up to 4 hours before a trigger for spasm occurs. During this approximate 4-hour period in which β-agonists work, bronchial hyperresponsiveness in asthma is also reduced.

    The specific mechanism of action of the β-agonists can be viewed under β-agonists for asthma.

    1

    β-agonists do NOT protect against hyperresponsiveness. 

    2

    β2-agonists will be effective only in acute inflammatory states. 

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