Leukotriene pathway inhibitors

thumb|300px|Abbott Laboratories stock bottle of Zyflo (zileuton) 600 mg tablets (manufactured 1997). Also shown are Zyflo tablets, with one tab broken. Tablets are branded with the Abbott "a" logo and "ZL". Zileuton (trade name Zyflo) 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. Zileuton was introduced in 1996 by Abbott Laboratories and is now marketed in two formulations by Cornerstone Therapeutics Inc. under the brand names Zyflo and Zyflo CR. The original immediate-r