http://www.medications.com/effect/view/40260 I have been really stressed out about the behavior of my 5 year old son. He is having uncontrollable tantrums, crying spells, aggressive behavior towards me, his dad and his 2 year old brother. He does fine at school according to the teacher. So I thought i Thu, 26 Mar 2009 11:26:29 -0400 http://www.medications.com/effect/view/40260?item=18518 As I read your comments ( and read them to a co-worker) I felt like I had written this. My son is 5 years old and has been on Singulair for roughly 6 months for allergies and we have been experiencing the EXACT things you have. My normally sweet little b http://www.medications.com/effect/view/40260?item=18518 Thu, 26 Mar 2009 23:21:08 -0400 http://www.medications.com/effect/view/40260?item=18541 I posted the message prior to yours, and I, as well, am baffled at the number of complaints about Singulair! Even after reporting the side effects to our doctor, they still weren't convinced it was the medication. My daughter also was fine at school (I c http://www.medications.com/effect/view/40260?item=18541