Final answer:
The type of asthma medication that can suppress the immune system is corticosteroids, which are effective for long-term control of asthma and reducing airway inflammation.
Step-by-step explanation:
The type of asthma medication that can suppress the immune system is corticosteroids. Corticosteroids are considered the most effective treatment for long-term control of asthma and are used to reduce inflammation in the airways and improve breathing. They are common in treating type III hypersensitivity reactions, which include certain asthma cases. Corticosteroids can be administered in different forms, including inhalers for local treatment, or oral or intravenous forms for systemic treatment. These medications are important for managing chronic conditions and preventing asthma attacks, although they do come with a potential downside of suppressing the immune system when used in systemic forms or over long periods.