Displaying 7 results of Modafinil Impurities Modafinil is a popular medication used to treat sleep disorders and other conditions such as narcolepsy and ADHD. However, during the manufacturing process of modafinil, impurities may be introduced into the final product, which can affect the efficacy and safety of the medication. Therefore, it is crucial to monitor and control the presence of impurities in modafinil to ensure its quality and effectiveness. Some of the common modafinil impurities include modafinil acid, modafinil sulfone, and modafinil amide.