The application dimension of the Amphetamine Drug market is anchored by four primary therapeutic uses: Attention‑Deficit/Hyperactivity Disorder (ADHD), narcolepsy, obesity management, and cognitive enhancement. ADHD accounts for the largest share, driven by widespread diagnosis across pediatric and adult populations and sustained prescription volumes. Narcolepsy, while a smaller patient pool, commands higher per‑patient spend due to chronic dosing requirements and limited alternative therapies. Obesity treatment contributes a moderate share, reflecting recent regulatory approvals of amphetamine‑based formulations for weight control and growing clinician adoption. Cognitive enhancement, largely off‑label, represents the smallest yet rapidly evolving segment, influenced by rising demand in high‑performance environments and emerging research on neuro‑stimulant benefits. Together, these applications delineate the market’s revenue distribution and guide strategic allocation of R&D, marketing, and regulatory resources. This analysis underpins the broader Amphetamine Drug segmentation framework, illustrating how each therapeutic niche supports overall market size.