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 was overtired but I can't get him to go to sleep either. I'm going to ask his doctor about this on his next appointment. Are we the only parents who are experiencing this? Thanks for mentioning it online.
star pupil been complaining hyperactive well behaved dramatically go to sleep son cries behavior change drop of a hat