"i have taken adderall xr for 6 years now. i started with 20mg once a day and now i am taking 25mg twice a day. i had severe adhd since i was very young and adderall xr seems to have taken me out of a fog i felt for many years. after reading other postings i question if i am taking too much of this drug. i do not have any side effects, but i can definitely tell when it is wearing off. it seems i cannot wake up without it and my second dose at noon is never forgotten, or i will start to really drag. i&#039;m worried i am dependent on this drug and it scares me. now it seems like the dosage is not as effective as i am very tired by 8:00 pm. overall this drug has helped me tremendously with adhd and depression."