Rivastigmine-d6 tartrate is primarily used in research and development as a labeled internal standard in analytical studies. It aids in the quantitative analysis of Rivastigmine in biological samples, ensuring accurate measurement and validation in pharmacokinetic and pharmacodynamic studies. This compound is particularly valuable in mass spectrometry and chromatography techniques, where its isotopic labeling allows for precise tracking and differentiation from the non-labeled Rivastigmine. Its application is crucial in advancing understanding of drug metabolism, absorption, and distribution in clinical and preclinical research.