A blue asthma inhaler is a type of inhaler commonly used to relieve symptoms of asthma. It typically contains a medication called a short-acting beta agonist (SABA), such as albuterol or salbutamol. These medications work by relaxing the muscles in the airways, making it easier to breathe during an asthma attack or when experiencing symptoms like wheezing, coughing, or shortness of breath. Blue inhalers are often referred to as "rescue inhalers" because they provide quick relief during asthma flare-ups or episodes of bronchospasm.