My 5yo son is one week removed from Singulair, and we are starting to see a gradual improvement. When I first started reading these posts, I just sat and cried. My son started the meds last fall for allergy induced asthma and his behavoir has gotten progressively worse this January and February, so much so that I contacted the pediatrician to start the process of having him see a counselor. He was fine before last August. I blamed his problems in the fall to his adjustment to kindergarten, then my grandmother got sick and passed away February, so I thought this time his obsession with death and bad behavior at school was related to her. I never once even thought it was the Singulair. Looking back I realized the behavoir coincided with his Singulair use (I took him off it in December because there was nothing in the air to cause him to cough and he was fine). In January we started back up full steam ahead and the doctor increased dose...Hello!! He was so angry sometimes and had a multitude of the symptoms listed on this site. He would constantly say he hated school. He chewed his shirts repeatedly, actually chewing holes in the neck and sleeves, he would blink his eyes weirdly which I have equate to the "tick" other people described. He would say he was stupid, that no one loved him, that no kids wanted to play with him and that he was an idiot. He said he wished he was in heaven and wanted to leave this world. My mom found him wrapped in blankets over spring break and when she asked what he was doing he said he was trying to suffocate himself. His crying wasn't even a normal cry, it was in a word: soulful. It would make me cry just hearing it because it was such a mournful sound. At his aftercare program he would try and leave and say he wanted to get hit by a car, they actually had to restrain him. He had instances of aggression with other kids in school, which resulted in phone calls from the teacher and principal. Again I thought it was related to the death in the family and him having no other way of expressing his anger. I even blamed the other parent thinking they were overreacting - embarrassed about that now to say the least. I started getting names of dr's to get grief counseling to determine if it was the loss or if he was in the throes of depression. Then I see the news about Singulair and looked it up on the web since he was on it. Talk about taking your breath away. Then his stomach cramps made sense too. I would have to massage his stomach to make it feel better, thinking it was the milk causing it. People can say we are all making this up, or the posts are fake...even his allergist said they feel the benefits outweight the risks, but until you live it you really just don't get it. I took him off it that night. Each day is getting better. Today was a great day and I am cautiously optimistic for tomorrow. He was happy. Even his sister remarked about what a good mood he was in and that he wasn't whining or crying. Putting him to bed tonight he told me he loved me more than tomato pie...and in his world that's at the top of everything The sad thing is that the medicine works for the asthma and controlled his coughing. The cough is now back in force so it is a double edged sword. It's amazing how similiar the symptoms are with other kids. I guess hindsight truly is 20/20 huh?