"i am a 20 year old male, 175 lbs, and this was my first time taking add medication in my life. i have always had problems concentrating and get drowsy during the day and so have had problems doing homework/studying for college. i took 2 pills of 15mg capsules both at once at about 1pm. it was great. i was able to concentrate and do a huge amount of homework with out stopping. however, there were side effects. i couldn&#039;t stop chewing gum the whole time i was on it (or else i would grind my teeth). i couldn&#039;t eat anything and i ended up not being able to sleep all night. so i like the positives."