I am so glad to find this site. My 3 almost 4 year old has shown extremely agressive behavior and temper tantrums since she has been on this med (4-6 weeks) She never acted like this before, and has been giving her daycare fits. Her doctor prescribed this med for her allergies which I thought was strange with all the other medications out there. We are taking her off of it immediately. Thanks for all the good info.