<prompt> Montelukast isSelective antagonists of leukotrienes receptorLipooxygenase inhibitorH1 antagonistH3 antagonist  <response>: Montelukast and zafirlukast is selective antagonists of the CysLT1 receptor for leukotrienes. Competetively inhibit the bronchoconstictor effects of leukotrienes. Basic and clinical pharmacology Katzung 13th edition pg 324 