"i have been taking this medicine for over 6 years now. i was diagnosed with adhd at the age of nine (now 24) and have taken numerous other adhd meds. i feel out of all of them concerta has been the most successful. i do however feel it makes me zone out and am quiet at times. most think something is wrong with me but i feel it&#039;s the medication. i am typically chatty and friendly most times. it tends to happen when i&#039;m one on one with people rather than a group setting."