2-Methyl-2,7-diazaspiro[4.4]nonane dihydrochloride is primarily used in pharmaceutical research and development. It serves as a key intermediate in the synthesis of various bioactive compounds, particularly those targeting the central nervous system. Its spirocyclic structure makes it valuable for creating molecules with potential therapeutic effects, such as antipsychotic or antidepressant agents. Researchers utilize it to explore new drug candidates, focusing on its ability to interact with specific receptors or enzymes in the brain. Additionally, it is employed in medicinal chemistry to optimize the pharmacokinetic and pharmacodynamic properties of experimental drugs.