Adderall is a stimulant category medication that helps manage the ADHD (attention deficit hyperactivity disorder) symptoms. People can easily buy Adderall online if they have a doctor's prescription. This medicine is a controlled substance because it works directly on the brain by influencing certain neurotransmitters' levels and functioning, making improper use of this drug harmful. Also, prolonged and unsupervised use can result in Adderall addiction.