6-Bromo-1,2,3,4-tetrahydroisoquinoline hydrochloride is primarily used in pharmaceutical research and development. It serves as a key intermediate in the synthesis of various biologically active compounds, particularly those targeting the central nervous system. Its structure is valuable in creating potential therapeutic agents for neurological disorders, such as Parkinson's disease and depression. Additionally, it is utilized in the study of receptor binding and enzyme inhibition, aiding in the discovery of new drugs. The compound’s bromine moiety makes it a versatile building block for further chemical modifications in medicinal chemistry.