Singulair
"My wife was on this stuff for at least a couple of years.  She suffered severe tiredness, nightmares, irritability, and even suicidal thoughts, accompanied with severe depression! 

Although it did make her feel better the side effects are not worth it at all!  She switched to flonaze and it is just as Good.  Please, if you are on  this medicine and have any of these side effects,please stop!"