Singulair is bad!! I have posted this before in October but just noticed the posting is no longer there??? My son is 4 and had horrible side effects. He has been medically cleared by 3 different physicians and everything leads back to the Singulair. We have a happy loving home, no stress than normal everyday stuff. He does great in his catholic school setting. He literally was as almost as a picture perfect kid as you could get. He was only on Singulair. About 2 months ago things started to happen. Unexplained fevers of always 102 or higher, severe headaches, seeing colors, joint and leg pain, stomach aches, sleep walking, night terrors, bad nail biting habit, depression, extremely emotional, chronic sinus infections, poor appetite, and weight loss. He just simply looked lethargic all the time. He missed school, fun activities and simply started to loose interest in things. I too knew something was wrong. The pediatrician thought I was too a hypochondriac. Then one night he had an emotional break down. He said things no 4 year old should ever think let alone say. Like he wanted to hurt us with knifes, he didn't love anyone, he hated Jesus. All along while crying because he did not understand why he felt this way. He wanted to die he said! I was so devastated. His teacher and our family could not believe the night and day difference in him. He was so happy and such a nurturing child to others. Now he simply had no emotion. You could look right through him. So after several doctors and psychiatrist they have concurred that the Singulair has thrown his Serotonin off. So he now has this chemical imbalance that we are working through with a psychiatrist who our insurance does not cover but is the best. All the other physical symptoms have subsided, he eats like a horse now, and no more nail biting, headaches or fevers. HMM coincidence... I think not!!! I have tried very hard to get the word out. I have had so much response just via private email that my friends have forwarded and so on. This is not isolated incidences. We are just the lucky ones to have discovered this website. Imagine those kids and adults that are still suffering. I work on an ambulance and i can tell you we had a 4 year old boy have a seizure out of the blue with no recent illness or history. Guess what med he was one??? Write every health official, contact the FDA, attorney general. Seriously this is the only way things will change!!