N-Propylamphetamine hydrochloride is primarily used in research settings, particularly in studies related to neuroscience and pharmacology. It serves as a reference compound for investigating the effects of amphetamine derivatives on the central nervous system. Researchers utilize it to explore its interactions with neurotransmitter systems, such as dopamine and norepinephrine, to better understand its stimulant properties and potential impact on behavior and cognition. Additionally, it may be employed in the development of analytical methods for detecting and quantifying similar substances in biological samples. Its application is strictly confined to controlled scientific environments due to its psychoactive nature.