Benzylhydrazine dihydrochloride is primarily used in organic synthesis as a reagent for the preparation of various hydrazine derivatives. It serves as a key intermediate in the production of pharmaceuticals, particularly in the synthesis of compounds with potential therapeutic properties. In medicinal chemistry, it is employed to create hydrazide and hydrazone derivatives, which are often explored for their antimicrobial, anticancer, and anti-inflammatory activities. Additionally, it finds application in the development of agrochemicals, where it contributes to the synthesis of pesticides and herbicides. Its role in chemical research includes facilitating the study of reaction mechanisms and the development of novel organic compounds.