Alcaftadine is a medication used to treat allergic conjunctivitis. Impurities in Alcaftadine may be present due to the synthesis process or degradation of the drug. These impurities can affect the purity, stability, and efficacy of the medication. Therefore, it is essential to monitor and control the levels of impurities in Alcaftadine during the manufacturing process and storage. The presence of impurities can also have safety implications for patients, as they may cause adverse reactions or affect the quality of the treatment.