http://www.medications.com/effect/view/24398 my 5 yr old has been on singulair for 2 months and her behavior has changed dramatically. She is moody, hyperactive and aggressive. Her teachers have been complaining about her behavior and last year she was their star pupil. She has always been a relativel Thu, 18 Oct 2007 18:31:02 +0000 http://www.medications.com/effect/view/24398?item=2463 I got online tonight to see if any other parents notice a behavior change in their children after going on Singulair. My 4-year-old son cries at the drop of a hat and the only thing that has really changed is his prescription for Singulair. I thought he http://www.medications.com/effect/view/24398?item=2463