All bronchodilators are considered long-acting inhaled beta₂-adrenergic agonists, because they temporarily dilate or relax the muscles surrounding the bronchial tubes that tighten during an asthma attack.

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Bronchodilators are available as either short-acting or long-acting inhaled beta₂-adrenergic agonists. Short-acting inhaled beta₂-adrenergic agonists temporarily dilate or relax the muscles surrounding the bronchial tubes that tighten during an asthma attack. Long-acting beta₂-adrenergic agonists relax bronchial smooth muscles and inhibit release of mast cell inhibitors providing a longer term effect.

All Bronchodilators Are Considered Long-Acting Inhaled Beta₂-Adrenergic Agonists, Because They