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Blue asthma inhaler is typically a type of short-acting bronchodilator, commonly referred to as a "rescue inhaler." It is used to provide quick relief from asthma symptoms, such as wheezing, coughing, and shortness of breath. The active ingredient in these inhalers is often albuterol. This is the most common active ingredient. It works by relaxing the muscles around the airways in the lungs, making it easier to breathe.