<prompt> Zileuton is -5 lipooxygenase inhibitorTX A2 inhibitorLeukotriene receptor antagonistProstaglandins synthesis inhibitor  <response>: Ans. is a i.e., 5 lipooxygenase inhibitor 5-lipoxygenase inhibitoro 5-lipoxygenase involved in production of leukotrienes especially LTB4 chemoattractant and LTC4, LTD4 Bronchoconstrictor. These are the most important mediators in bronchial asthma.o Zileuton inhibits 5-lipxygenase and thereby the production of leukotrienes. Therefore, Zileuton is useful in the treatment of asthma. 