Solriamfetol is a medication that is used to treat excessive sleepiness caused by narcolepsy or obstructive sleep apnea. Impurities in Solriamfetol refer to any unwanted or potentially harmful substances that may be present in the medication. It is important to identify and control impurities in pharmaceuticals to ensure their safety and effectiveness. Quality control measures are put in place to minimize impurities and ensure the purity and stability of Solriamfetol.