Anidulafungin is an antifungal drug used to treat invasive fungal infections. Anidulafungin impurities are substances that are present in the drug substance or drug product that are not the intended active ingredient. These impurities can affect the efficacy and safety of the drug and must be identified, characterized, and controlled through rigorous testing and quality assurance procedures. Proper management of anidulafungin impurities is essential for ensuring the quality and safety of the drug product for patients.