Amantadine-D6, a deuterated form of amantadine, is primarily used in research and analytical applications. Its stable isotope labeling makes it a valuable internal standard in mass spectrometry and other analytical techniques for quantifying amantadine in biological samples. This allows for precise measurement of drug concentrations in pharmacokinetic studies, aiding in understanding drug metabolism and distribution in the body. Additionally, it is utilized in the development and validation of analytical methods for detecting amantadine in pharmaceuticals and environmental samples, ensuring accuracy and reliability in testing procedures.