Antiasthmatic Drugs: Purpose
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For people with asthma, the simple act of breathing can be a struggle. Their airways become inflamed and blocked with mucus during asthma attacks, narrowing the opening through which air passes. This is not such a problem when the person breathes in, because the airways naturally expand when a person takes a breath. The real problem arises when the person with asthma tries to breathe out. The air cannot get out through the blocked airways, so it stays trapped in the lungs. With each new breath, the person can take in only a little more air, so breathing becomes shallow and takes more and more effort.
Asthma attacks can be caused by allergies to pollen, dust, pets or other things, but people without known allergies may also have asthma. Exercise, stress, intense emotions, exposure to cold, certain medicines and some medical conditions also can bring on attacks.
The two main approaches to dealing with asthma are avoiding substances and situations that trigger attacks and using medicines that treat or prevent the symptoms. With a combination of the two, most people with asthma can find relief and live normal lives.
— Nancy Ross-Flanigan
