I have been on it for over 3 yrs too,like all my other medicine too.To tell you the truth about all the medicine I have ever took,none seem to really help,i take medicine for memory,and also to keep me awake also,just so I won't have seizure,put the only thing that has stopped me,and thats when I had I had my surgey,and with me taking my medicine,it's finally under contol,all everyone reacts different to medicine so good look