You did not even provide what you got it for in the first place. Maybe you can offer more info, comment on this answer.
There are a number of medicines available to treat ADHD.
Finding the right one for a particular patient is frequently a trial and error situation.
I remember there were about 7 medications available when I was first diagnosed.
I tried 6 and the 7th was the one that changed my life.
Hang in there.