N-Methyl-1-phenylethanamine, also known as methamphetamine, is primarily used in the pharmaceutical industry as an active ingredient in prescription medications for treating attention deficit hyperactivity disorder (ADHD) and narcolepsy. It serves as a key intermediate in the synthesis of various central nervous system (CNS)-acting compounds, including other stimulants. Additionally, it is employed in research and development for novel therapeutic agents targeting neurological disorders. In organic synthesis, it functions as a building block for complex molecules in medicinal chemistry.