Tegaserod is a medication used to treat irritable bowel syndrome with constipation in women. However, it is important to ensure the purity of the drug, as impurities can affect its safety and efficacy. Tegaserod impurities may include degradation products, residual solvents, or other substances that were not intended to be present in the drug. Therefore, it is crucial to monitor and control impurities during the manufacturing process to maintain the quality and safety of the medication.