Fosphenytoin is an anticonvulsant drug used to treat seizures. Impurities in fosphenytoin can include degradation products, residual solvents, and other substances that may affect the drug's efficacy, safety, or stability. These impurities can be introduced during the manufacturing process, storage, or transportation, and may need to be monitored and controlled to ensure the quality of the drug product. Analytical methods such as chromatography and spectroscopy are commonly used to detect
