WAY-638103 is primarily used in scientific research to investigate neurological pathways related to serotonin receptors, particularly as a selective agonist targeting specific subtypes involved in mood and cognition regulation. It serves as a pharmacological tool to study receptor function and signaling mechanisms in vitro and in animal models. Its application supports the development of novel therapeutics for psychiatric disorders such as anxiety, depression, and schizophrenia by helping clarify the role of serotonergic transmission. Due to its research-specific nature, it is not used clinically and is limited to laboratory settings for mechanistic studies and target validation.