http://www.medications.com/effect/view/38903 Daughter just turned 2, started Singulair on her birthday, so it has only been 9 days. Already it has had such a positive effect on her reactive airway disease (a.k.a. asthma). In January, she had maybe a one-week break from constant runny nose, bad coughin Thu, 12 Feb 2009 21:12:05 -0500 http://www.medications.com/effect/view/38903?item=17028 We put our son on Singulair when he was 3 1/2 because it was easier to give him a pill than try to get him to use an inhaler. I wish I had never made that decision. I didn't know about any of the potential psychiatric side effects of this drug, and my son http://www.medications.com/effect/view/38903?item=17028