Hi! I started taking Concerta 18mgs about a week ago and since then I haven’t really felt the “stimulating” effects like I did before when I used to take it. I can’t sit still and concentrate on one thing because I have random garbage sitting in my head all the time, and there’s no tunnel vision when trying to focus. Weird thing is that this time when I went to go pick up my medicine it was a whole different pharmacy and different manufacturer. I’m not sure whether It’s the pharmacy providing me with bad quality medicine or my body just needs dose readjusting.