You can buy Strattera 18mg online,to increase concentration and be more focused.It is a non-stimulant ADHD medication used to treat symptoms of attention deficit hyperactivity disorder in children ages 6-12, adolescents, and adults.It was the first non-stimulant medication approved for ADHD treatment in the United States by the Food and Drug Administration in 2002.It may help to increase the ability to pay attention, concentrate, stay focused, and stop fidgeting. It is thought to work by restoring the balance of certain natural substances (neurotransmitters) in the brain.It works by increasing levels of norepinephrine, a chemical messenger in the brain that is involved in hyperactivity and impulse control.