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In line with the recent globalization of the drug supply chain and promotion of the use of generic drugs worldwide, quality assurance is required for drugs globally. In particular, controlling impurities is one of the biggest areas of interest regarding pharmaceutical quality, and it is desirable that the latest scientific standards harmonized in the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) are not only implemented in approval applications but also incorporated in pharmacopoeias which are public standards to ensure pharmaceutical quality more widely. However, incorporation into a pharmacopoeia takes time because careful consideration is required owing to the characteristics of a pharmacopoeia that is widely used for drugs, including those already on the market. To consider a smooth approach for the incorporation, we retrospectively examined approaches to incorporate the concepts of the ICH Q3C, Q3D, and M7 guidelines covering residual solvents, elemental impurities, and mutagenic impurities which are particularly toxic impurities into the European Pharmacopoeia, United States Pharmacopeia-National Formulary, and Japanese Pharmacopoeia, with approaches to implement these guidelines into approval processes in Europe, the U.S., and Japan. We also identified barriers and facilitators to this goal via cause and effect analysis. Moreover, we developed a logic model for the smooth incorporation of the concepts of impurity-related ICH guidelines. We expect that our proposed approach will be applied as a framework to smoothly incorporate the results of international harmonization activities for controlling impurities into each pharmacopoeia.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Development of a Logic Model for Promoting Incorporation of the Concepts of Impurity-Related ICH Guidelines into Pharmacopoeias Based on Cause and Effect Analysis