Montelukast Sulfoxide, a mixture of diastereomers, is primarily used in pharmaceutical research and development. It serves as a metabolite of Montelukast, a drug widely prescribed for managing asthma and allergic rhinitis. Researchers study this compound to better understand the metabolic pathways and pharmacokinetics of Montelukast, aiding in the optimization of therapeutic efficacy and safety. Additionally, it is utilized in the development of analytical methods for detecting and quantifying Montelukast and its metabolites in biological samples, ensuring accurate monitoring of drug levels in patients. This compound also plays a role in investigating potential drug interactions and side effects, contributing to improved patient care and treatment outcomes.