Ibudilast-d7 is primarily used in research and development as an internal standard in analytical chemistry. It is employed in mass spectrometry and chromatography studies to ensure accurate quantification and identification of its non-deuterated counterpart, Ibudilast. This application is crucial in pharmacokinetic studies, where precise measurement of drug concentrations in biological samples is required. Additionally, it aids in metabolic profiling and drug interaction studies, providing insights into the behavior and efficacy of Ibudilast in various therapeutic contexts.