Abstract
In the early 1990s numerous clinical trials with antileukotriene drugs confirmed the hypothesis that cysteinyl leukotrienes are important bronchoconstrictor agents in asthma. Newly releasedantiasthmatic medications include antileukotriene agents which function either by blocking the interaction of leukotrienes with receptors or by inhibiting leukotriene synthesis. Representatives of cysteinyl leukotriene receptors antagonists are zafirlukast (7), montelukast (8) and pranlukast (9). The bronchodilator efficacy and antiinflammatory property of antileukotriene drugs provided the main impetus behind their introduction as the first novel class of asthma therapy in more than 20 years.
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