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 attention deficit hyperactivity disorder (ADHD) and narcolepsy, a sleep disorder. Amphetamine increases the levels of certain neurotransmitters, which can enhance focus and alertness. This substance can be found in various forms, including tablets and extended-release capsules. While it can be effective for those with medical conditions, misuse or overuse can lead to serious side effects, including addiction and cardiovascular issues. It is classified as a controlled substance in many countries.