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How does arformoterol tartrate work?

People with chronic obstructive pulmonary disease (COPD) have difficulty moving air through their airways while breathing. In COPD, the smooth muscles that control the size of the airways (bronchioles) are contracted. This causes the airways to become narrow and resist the flow of air. Arformoterol binds to those smooth muscles and causes them to relax. The airways open up and air flow increases. This makes it easier for people with COPD to breathe.

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