http://www.medications.com/effect/view/41133 I was given Singulair about three months ago. The first few months I hadn't noticed anything extreme as far as side affects. However gradually my moods began to change. I became sullen and agitated at first. I thought perhaps I was coming down with somethin Sun, 03 May 2009 19:08:47 -0400 http://www.medications.com/effect/view/41133?item=19463 I am glad to hear you made the connection to Singulair and are feeling better. Please help us raise awareness of Singulair's side effects: file an adverse event report with the FDA: https://www.accessdata.fda.gov/scripts/medwatch/medwatch-online.htm and vi http://www.medications.com/effect/view/41133?item=19463