AR-M 1000390 hydrochloride is primarily utilized in research settings, particularly in the study of neurological and psychiatric disorders. It acts as a selective antagonist for certain serotonin receptors, making it valuable for investigating the role of these receptors in conditions such as anxiety, depression, and schizophrenia. Researchers use this compound to explore potential therapeutic pathways and to better understand the underlying mechanisms of these disorders. Its application is largely confined to preclinical studies, including in vitro experiments and animal models, to assess its effects on behavior and brain function.