Adderall is a medicine used to treat Attention Deficit Hyperactivity Disorder (ADHD). ADHD is a problem where it is hard for a person to focus, sit still, stay organized, or pay attention to things. Adderall helps people with ADHD manage their behavior and their ability to focus on tasks. Adderall works by changing the amounts of certain chemicals in your brain so you can stay focused and have more control over your behavior. Adderall can help people with ADHD concentrate and do tasks more easily, but it is important to remember that it won't cure ADHD. A doctor will usually prescribe Adderall after diagnosing someone with ADHD.