Used primarily as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of selective serotonin reuptake inhibitors (SSRIs) and related antidepressant drugs. Its hydrazine functionality allows for the formation of heterocyclic structures important in medicinal chemistry. It is also employed in the preparation of agrochemicals and bioactive molecules where a chlorinated benzyl hydrazine scaffold is required. The hydrochloride salt form enhances stability and solubility, making it suitable for use in polar reaction environments.