My 6 year old daughter Started taking Concerta about 3 months ago...

My son didnt take concerta , but he did take singulair,he would break down and cry and not no why,he had a lot of what if thinking, what if i go to school and something happens to you ,what if everyone thinks im dumb etc etc , it was crazy but only the beginning it got increasingly worst, in the end making him a prisoner in his mind , unable to function normally, 6 weeks off singulair and he is back to his happy self, by the way he is 15,he explains the difference as not being trapped in his thoughts.I wish you luck with what you decide but for us singulair was pure poisen

If I were in your shoes, I would also get your daughter off Concerta. At only 6 years old, there is plenty of time to worry about academic performance later. If her health improves by removing a potential source of neurotoxins, then she may be absolutely fine without any ADD/ADHD drug.

You can always reintroduce Concerta at a later time after you find out how she does without Singulair. Concerta is not essential to her health at this time.