SB 242084 hydrochloride is primarily used in research settings to study the role of serotonin receptors in the brain. It acts as a selective antagonist for the 5-HT2C receptor, making it a valuable tool for investigating the receptor's function in various physiological and behavioral processes. Researchers utilize it to explore its potential effects on anxiety, depression, and feeding behavior, as 5-HT2C receptors are known to influence these areas. Additionally, it aids in understanding the receptor's involvement in neurological disorders, such as schizophrenia and epilepsy, providing insights for potential therapeutic targets. Its application is limited to preclinical studies and is not used in clinical or industrial settings.