1-Methyl-1-phenylhydrazine is primarily used in organic synthesis as a building block for the preparation of various heterocyclic compounds. It serves as a key intermediate in the production of pharmaceuticals, particularly in the synthesis of drugs that target the central nervous system. Additionally, it is employed in the development of agrochemicals, where it contributes to the creation of pesticides and herbicides. The compound is also utilized in research laboratories for studying reaction mechanisms and developing new chemical entities with potential therapeutic or industrial applications. Its role in these fields highlights its importance in advancing both medicinal and agricultural sciences.