Without repeating what everyone else is already describing all I can say is Thank God!! My step son has been on Singulair as long as I can remember (6 years?)and his anger has been just what everyone describes. Before he could even form sentences he would lay down on the floor and repeatedly bang his head on the floor concrete, carpet, grass it didn't matter. He was diagnosed with ADHD about 4 years ago but his father and I were both desperately against medicating him because we didn't think this was the problem and no one was asking any questions or looking for other answers. He has now been put on 3 different meds for the ADHD and when they don't work they just keep upping the doses. He has since been committed to a hospital 4 or 5 times now for his anger and suicidal threats. HE IS 7!!! He doesn't even know what suicide is he just knows he doesn't want to be here anymore. The other night he pulled a knife on his mom out of the clear blue. They were laughing and playing, he went to the kitchen for jello and came back with a knife!! I don't know if Singulair is the cause but it sure sounds like it and I only PRAY we have finally found an answer and that everyone finally sees what his father and I have been screaming for many years now. Hopefully this will open his mothers eyes as well as the doctors. I PRAY with everything in me this has no long term effects. Also, looking back I realize he has always had problems with bad dreams. From the time they put him on Singulair he has not once slept through the night without wanting to join his daddy and me in bed. He is afraid to even go to bed without daddy. When I think about all the nights I wouldn't let him sleep in bed with us because I thought he was old enough to sleep alone at 7 I literally cry for what he must have been going through. Please let this be the answers to our prayers!!!