What distinguishes a reliever inhaler from a controller inhaler?

The distinction between a reliever inhaler and a controller inhaler is primarily based on their intended use and mechanism of action in asthma management. Controller inhalers are specifically designed to be used on a regular basis to manage and prevent asthma symptoms over the long term. They typically contain medications such as corticosteroids or long-acting beta-agonists that help reduce airway inflammation, thereby preventing asthma attacks and maintaining overall control of the condition.

Reliever inhalers, in contrast, are intended for immediate relief of asthma symptoms during an acute episode or flare-up. They act quickly by relaxing the muscles around the airways, allowing for easier breathing when symptoms arise. This immediate effect is crucial for providing symptom relief but does not contribute to long-term control of asthma.

The other options provided do not accurately capture the distinction between these inhalers. For instance, reliever inhalers are not intended solely for daily management or limited to use during sleep, and controller inhalers do not provide rapid symptom relief. Understanding the roles of these inhalers is crucial for effective asthma management, emphasizing the importance of adhering to prescribed regimens for both reliever and controller medications.