| The case history does not mention the duration of zafirlukast therapy and does not provide information about prior use of corticosteroids. |
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| Like zafirlukast, montelukast is a competitive antagonist for the cysteinyl leukotrienes. |
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| Montelukast and zafirlukast are LTRAs, which are the most recently introduced class of anti-asthma agents. |
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| Zileuton and zafirlukast should be avoided during pregnancy because they are teratogenic or fetotoxic in animals. |
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| Zileuton and zafirlukast are a more recent type of long-term-control medicine. |
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