Amphetamine is a central nervous system stimulant that affects chemicals in the brain and nerves contributing to hyperactivity and impulse control. It is commonly prescribed to treat conditions like Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy, helping individuals focus and stay awake. Amphetamine works by increasing the levels of certain neurotransmitters, such as dopamine and norepinephrine, which play key roles in attention and alertness. While it can be effective for medical purposes, misuse can lead to serious health risks, including addiction and cardiovascular issues.