Medication issue

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.

MFG: ACTAVIS

Technically it should be the same meds. If you have trouble with your meds, go to your doctor, he can help you with your worries and (if you need it) adjust your dose.