Fluphenazine is a potent antipsychotic drug that is used to treat schizophrenia and other mental illnesses. However, during the manufacturing process of fluphenazine, impurities may be generated. These impurities can be harmful and may affect the quality, safety, and efficacy of the drug. Therefore, it is crucial to monitor and control the levels of impurities in fluphenazine to ensure that the drug is safe and effective for patients.