I am so glad I found this site. I went to an ENT this week for problems I have been having with my Eustachian tubes.She checked my ears and said they were fine (which they are not) told me I had allergies and prescribed Singulair. I picked up the Rx today but when I started reading the side effects I decided to do some additional research. If Singulair causes depression and suicidal thoughts then forget it! I already suffer with depression. Thanks but no thanks. I guess I just threw $25.00(co-pay) out the window but better that than deal with these nasty side effects.