If you have asthma, there's a good chance that an underlying allergy —whether it's to dust mites, pollen, cockroaches, or cat dander—is playing a key role in your breathing problems. (About 60% to 90% of people with asthma have allergic asthma.)
The first step is to avoid the allergen, but that's not always possible or sufficient to stop symptoms, like coughing, wheezing, and shortness of breath.
That's where medication comes in. Here are some common drugs used to treat allergic asthma.
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Medications in the beta 2 -agonist class work by relaxing the muscles that wrap around the bronchi of the lungs and tend to squeeze down and narrow the airways in those who have asthma. The short-acting forms of beta 2 -agonists, such as albuterol, are used as first-line agents for relief of asthma in all patients with asthma. Long-acting versions of beta 2 -agonists were made by making some chemical changes in the short-acting beta 2 -agonists. These long-acting beta 2 -agonists are almost always prescribed together with anti-inflammatory medications for long-term control, rarely if ever by themselves. They are usually added when a conventional dose of an inhaled steroid is not adequate for control of daily symptoms.