Definition: Controller Medications
Many people with asthma need to take medication every day to control their asthma. But there's a good reason for taking a medication even when you feel OK and don't notice asthma symptoms: Controller medications work by keeping the airways in the lungs open and clear, making it easier to breathe. But these medicines work slowly over time. It may take days or weeks for them to start working and keeping the airways from becoming swollen and narrow. That's why they're called controller medications - a person with asthma needs to take them regularly to control the condition.
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