Our normally mild-mannered 7-year-old son has only been on Singul...

Our normally mild-mannered 7-year-old son has only been on Singulair for a few days, and we noticed immediate behavioral changes including acting out, aggressive behavior, and he even went so far as to hit another child with a baseball bat at baseball practice last night! Because we had also experienced behavioral side effects with Zyrtec (aggressiveness, etc.), we were particularly in tune with the possiblity that sudden changes of this type might be attributable to the medications. We had thought that switching him to the Singulair would help with the allergies and NOT have the behavioral side effects that we had experienced with the Zyrtec, but found instead that it was even worse! I think we're going to stay off all drugs and just buy extra kleenex for allergies!