Elemental Impurities Guidance Published

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FDA has published an International Conference on Harmonization (ICH) guidance, Q3D(R1) Elemental Impurities, addressing (1) the evaluation of toxicity data for potential elemental impurities; (2) the establishment of a permitted daily exposure (PDE) for each element of toxicological concern, and (3) the application of a risk-based approach to control elemental impurities in drug products. The document says that because elemental impurities do not provide any therapeutic benefit to a patient, their levels in a drug product should be controlled within acceptable limits.

Applicants are not expected to tighten the limits based on process capability, FDA says, provided that the elemental impurities in drug products do not exceed the PDEs.

The guidance presents a process to assess and control elemental impurities in the drug product using the risk management principles described in another ICH guidance. “This process provides a platform for developing a risk-based control strategy to limit elemental impurities in the drug product,” it says.

The contents include Introduction, Scope, Safety Assessment of Potential Elemental Impurities, Element Classification, Risk Assessment and Control of Elemental Impurities, Glossary, References, and four appendices.

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