Evekeo to treat your ADHD. Amphetamine is a stimulant medicine that is used to treat attention deficit hyperactivity disorder (ADHD) in children. Some brands of amphetamine are for children 6 years and older. Buy Evekeo Online can be used by children as young as 3 years old. It is a type of disorder in which people don’t pay attention to one place and they don’t focus on any activity. So Evekeo helps to treat this kind of disorder.