I can answer this for you. Yes, you can combine a stimulant like Conderta with Strattera. A lot of doctors recommend that children stay on their stimulant for like two weeks and then taper off. This is so, because Strattera needs time to build up, it can take up to three months. In order to get the kids some type of "coverage" till Strattera kicks in, you can leave your child on Concerta. Some doctors even combine the two, stimulant as well as Strattera.