The drugs are normally prescribed to treat attention deficit hyperactivity disorder (ADHD), but healthy students use them to get a leg up in school, by improving focus, concentration and memory.
Adrenaline, or epinephrine, is a hormone that dilates an individual's air passages and increases his heart rate when he is faced with a stressful situation. The hormone is secreted from the adrenal glands to help ensure survival under dangerous situations.
1 Nervous Energy At its core, agitation and restlessness are due to nervous energy. 2  Anxiety provides a constant flow of adrenaline in your system. 3  This adrenaline puts your entire body on edge, because it's preparing you for fight or flight - an evolutionary system designed to keep you safe in times of danger.