5-Methylhydantoin is primarily used in the synthesis of pharmaceuticals and organic compounds. It serves as a key intermediate in the production of various drugs, particularly those targeting neurological and cardiovascular conditions. Additionally, it is utilized in the development of anticonvulsant and anti-inflammatory medications. In industrial applications, it acts as a stabilizer in certain chemical processes and is employed in the manufacture of specialty chemicals. Its role in research includes being a building block for studying enzyme inhibitors and other biologically active molecules.