By conducting a transporter interaction assessment, researchers can identify potential drug-drug interactions, predict adverse effects, and optimize drug efficacy and safety. This process often involves in vitro assays using cell lines that express specific transporters, such as P-glycoprotein or organic anion-transporting polypeptides. Understanding these interactions not only aids in the rational design of new drugs but also helps in the regulatory assessment of drug candidates by providing crucial data on their transport and interaction profiles.