http://www.medications.com/effect/view/37797 my granddaughter has been on singulair since she was 5 months old she is now 6yrs old and it does control her asthma, but lately i have noticed a lot of the symptoms posted here. Headache, stomach pains, nightmares, sleepwalking, and the episodes are gettin Wed, 07 Jan 2009 12:46:22 -0500 http://www.medications.com/effect/view/37797?item=15789 Please visit www.parentsforsafety.org for more information on Singulair's side effects. Many parents have reported that their children's doctors were unaware that Singulair can have terrible physical and psychiatric side effects - even though most of the s http://www.medications.com/effect/view/37797?item=15789