Methylphenidate hydrochloride is the hydrochloride salt of methylphenidate, a central nervous system stimulant belonging to the phenethylamine and piperidine classes. It functions as a dopamine-norepinephrine reuptake inhibitor and is primarily utilized as an active pharmaceutical ingredient (API) in medications for treating attention deficit hyperactivity disorder (ADHD) and narcolepsy. As a specialty chemical, this high-purity reagent (≥94.5%, confirmed by NMR, IR, and other analyses) is employed in pharmaceutical research, analytical standards, drug development, and synthesis of related compounds.