Excerpt from http://www.coloradohealthnet.org/asthma/asthma_comp2.html

More properly known as Beta-adrenergic agonists Beta2-agonists relax airways, smooth muscle and may modulate mediator release from mast cells and basophils. The desirable effects of beta2-adrenergic agonists in asthma therapy result from their action on beta2-adrenergic receptors.

Commonly used to relieve the symptoms of Asthma

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