Montelukast Sulfone is primarily used in the field of pharmaceutical research and development. It serves as a metabolite of Montelukast, a drug commonly prescribed for the management of asthma and allergic rhinitis. Researchers utilize Montelukast Sulfone to study the pharmacokinetics and metabolic pathways of Montelukast, helping to understand how the drug is processed within the body. This information is crucial for optimizing drug efficacy and safety. Additionally, it is employed in analytical chemistry as a reference standard in high-performance liquid chromatography (HPLC) and mass spectrometry (MS) to ensure accurate measurement and detection of Montelukast and its metabolites in biological samples. This aids in monitoring drug levels in patients and ensuring compliance with therapeutic guidelines.