Pimecrolimus is an immunosuppressant drug used for the treatment of eczema. However, during its production, impurities can be generated, which may affect the safety and efficacy of the drug. The impurities can include related substances, degradation products, and residual solvents. Therefore, it is important to monitor and control these impurities to ensure the quality of the final product. Various analytical methods such as HPLC, GC, and NMR are used for the detection and quantification of Pimecrolimus impurities.
