Isopropanol-Rosuvastatin impurity is a solvent-related adduct formed during synthetic or recrystallization steps when isopropanol interacts with rosuvastatin intermediates. It may arise via esterification or solvate formation and can compromise API purity and stability if uncontrolled. Analytical identification employs HPLC with photodiode array detection, LC-MS for mass confirmation and NMR for structural elucidation. Control strategies include solvent replacement, optimized crystallization, extended drying, and in-process monitoring. Establishment of qualification thresholds and routine impurity profiling aligned with ICH guidelines ensures product quality. Monitoring limits and corrective actions mitigate risks to potency and safety in drug substance manufacture.
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