<prompt> Zileuton is a5 lipooxygenase inhibitorTXA2 inhibitorLeukoteriene receptor antagonistProstaglandin synthesis inhibitor  <response>: Zileuton is an orally active inhibitor of 5-lipoxygenase, and thus inhibits leukotrienes LTB4, LTC4, LTD4, and LTE4 formation, used for the maintenance treatment of asthma. Ref: KD Tripathi 8th ed 