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A blue asthma inhaler is a medical device used to deliver medication directly into the lungs to relieve or prevent symptoms of asthma, such as wheezing, coughing, and shortness of breath. The blue color typically indicates that it is a "reliever" inhaler, containing a fast-acting bronchodilator like albuterol (also known as salbutamol), which works quickly to relax the muscles around the airways, making it easier to breathe. These inhalers are often used on an as-needed basis to provide immediate relief during an asthma attack or before engaging in activities that may trigger symptoms. It’s important for individuals with asthma to carry their inhaler with them at all times and to use it according to their healthcare provider's instructions.