Methoxytyramine solution is primarily used in biochemical research to study neurotransmitter pathways and dopamine metabolism. It serves as a key metabolite in the analysis of catecholamine-related disorders, such as Parkinson's disease and neuroendocrine tumors. In clinical diagnostics, it aids in assessing the activity of enzymes like catechol-O-methyltransferase (COMT), which is crucial for understanding drug efficacy and metabolic processes. Additionally, it is utilized in laboratory experiments to simulate or inhibit specific biochemical reactions, providing insights into the regulation of dopaminergic systems.