Dextrorphan tartrate is primarily used in research settings to study its effects on the central nervous system, particularly as an NMDA receptor antagonist. It has been explored for its potential neuroprotective properties, which could be beneficial in conditions like stroke or traumatic brain injury. Additionally, it has been investigated for its role in reducing excitotoxicity, a process that can lead to neuronal damage. While not widely used in clinical practice, its pharmacological properties make it a valuable tool in neuroscience and drug development studies.