Editing Bronchodilator (section)

==Long-acting β<sub>2</sub>-adrenergic agonists==
{{main article|Long-acting beta-adrenoceptor agonist}}
These are long-term medications taken routinely in order to control and prevent bronchoconstriction. They are not intended for fast relief. These medications may take longer to begin working, but relieve airway constriction for up to 12 hours.
Commonly taken twice a day with an anti-inflammatory medication, they maintain open airways and prevent asthma symptoms, particularly at night.{{citation needed|date=February 2022}}

[[Salmeterol]] and [[formoterol]] are examples of these.