http://www.medications.com/effect/view/29419 When I saw that researchers acknowledged the number of potential gene variants that are involved in determining the efficacy of montelukast and then I am reading the reports of the side effects, I am wondering why montelukast was ever approved for seasona Thu, 10 Apr 2008 15:34:41 -0400 http://www.medications.com/effect/view/29419?item=6967 I believe it was first approved for asthma, especially allergic asthma, and then later the marketing went toward seasonal indoor/outdoor allergies - safe because it wasn't a steroid (sold a lot of people on it). The chest journal website is one of my favor http://www.medications.com/effect/view/29419?item=6967