Inhalers can be a lifeline for people with asthma. When coughing, wheezing, or shortness of breath occurs, a quick hit of a bronchodilator can often make those symptoms go away. 
In particular, the medications known as short-acting beta2-agonists (a type of bronchodilator) can provide quick relief from asthma symptoms—but they can also be damaging if they are used too often. Using short-acting beta2-agonists too often is a sign that asthma is out of control.
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