(Medicamentos de control) 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.