http://www.medications.com/effect/view/41995 My 4 yr old son has been on Singulair for a little over a month...prescribed after asthma attack and severe allergies. He has been a different child, extremely aggressive, out-of-control, and very hyper. I am so tired of having to get on to him constantly Fri, 12 Jun 2009 06:02:02 -0400 http://www.medications.com/effect/view/41995?item=20545 Please take the time to report to the FDA,Thank You http://www.medications.com/effect/view/41995?item=20545