http://www.medications.com/effect/view/28789 my daughter is 7 and has been taking Singulair for the past year. she has exhibited many of the symptoms described in these blogs.....she constantly complains of stomach aches and headaches. wakes up at night saying mommy i had a bad dream....(has not don Sun, 30 Mar 2008 19:30:32 -0400 http://www.medications.com/effect/view/28789?item=6249 My six year old son has had all these same side effects you listed, and also leg pain at night and in the morning. He also gets so upset over small things that he says he just wants to die! This is so scary for kids to have to deal with these side effects! http://www.medications.com/effect/view/28789?item=6249