http://www.medications.com/effect/view/40158 My 3 year old has been on Singulair off and on since he was 1. This last time he started in November of 2008 and began getting agitated, extremely moody, and having fits of anger by Christmas. I thought it was a phase until about 2 weeks ago when my son's Sun, 22 Mar 2009 07:56:13 -0400 http://www.medications.com/effect/view/40158?item=18321 Please visit www.parentsforsafety.org there are helpful stories about time lines of side effects symptoms.Because of the amount of time being on the drug and the age, sometimes it is learned behaviors and will take a little patience and love to get throu http://www.medications.com/effect/view/40158?item=18321 Tue, 24 Mar 2009 15:31:39 -0400 http://www.medications.com/effect/view/40158?item=18428 Well, my son has been on this medication every since he was 9 months and he don't have no effects from it,it may be it's for some children but not all kids and the only reason he's taking the medication is because he has asthma and this medication really h http://www.medications.com/effect/view/40158?item=18428 Tue, 24 Mar 2009 18:22:19 -0400 http://www.medications.com/effect/view/40158?item=18444 I'm just sitting here shaking my head. I don't even know how to respond to the previous comment. http://www.medications.com/effect/view/40158?item=18444