Gimeracil is an anticancer drug used in combination with other chemotherapeutic agents. However, impurities in the drug can affect its efficacy and safety. Gimeracil impurities are unwanted substances that can be present during the drug manufacturing process, storage or transportation. These impurities may include residual solvents, process-related impurities, and degradation products. It is important to control and monitor the levels of these impurities to ensure the safety and efficacy of the drug.