Dasabuvir-d6 is primarily used in research and development as an isotopically labeled internal standard in mass spectrometry-based assays. It aids in the accurate quantification and pharmacokinetic studies of Dasabuvir, a drug used to treat hepatitis C virus (HCV) infection. By providing a stable reference point, it ensures precision in measuring drug concentrations in biological samples, such as blood or plasma. This is crucial for understanding drug metabolism, absorption, and elimination in clinical trials. Additionally, it supports the development of analytical methods for quality control in pharmaceutical manufacturing, ensuring consistency and efficacy of the active pharmaceutical ingredient. Its use enhances the reliability of data in both preclinical and clinical research settings.