A rescue inhaler is a type of inhaler that dispenses medication called a bronchodilator, which expands or dilates the airways, making it easier to breathe. It is used to relieve or stop the symptoms of an asthma attack. Rescue inhalers work by relaxing the muscles in the airways, which allows for better airflow. They are also used to clear mucus from the lungs, as the airways open, the mucus moves more freely and can be coughed out more easily. Short-acting bronchodilators are called quick-acting, reliever, or rescue medications. They relieve acute asthma symptoms or attacks very quickly by opening the airways. The rescue inhalers are best for treating sudden asthma symptoms. The action of inhaled bronchodilators starts within minutes after you inhale them and lasts for 2 to 4 hours. Long-acting bronchodilators help control asthma symptoms by keeping the airways open for 12 hours, preventing asthma attacks. It is important to note that rescue inhalers are mostly for emergency symptom management, but they can sometimes be overused. Overuse of short-acting bronchodilators, whether it’s a rescue inhaler, in tablets, or in other forms, can cause a patient to develop tolerance to the medication over time, making the medication less effective.