Displaying 14 results of Valaciclovir Impurities Valaciclovir is an antiviral medication used to treat herpes simplex and varicella-zoster infections. However, the drug may contain impurities that can negatively impact its efficacy and safety. These impurities may include degradation products, residual solvents, and other contaminants. Therefore, the identification and control of Valaciclovir impurities are crucial to ensuring the drug's quality and patient safety.