Rowdy symptoms and conditions

My son is 7 and has been taking singulair for about 3 1/2 years, we first noticed that he was rowdy and very tempermental, he also had trouble sttling down at night. The Dr. didn't put much faith in my concern for the medication. Recently he has tried to seriously harm himself and has been quite down, we have seen the Dr. and he has never once woried about the side effects of the medication. i came across some very disturbing information in the canadian cps boo that supported my theory and have taken him off the medication, within the first few days he seemed very down, but has now returened to my fun loving sweet little boy. Thanks to everyone for sharing I would never have thougth to pursue this if there were not other parents who had the same experience.