ICH M4S - Common Technical Document - Safety

What it says

The Safety module of a marketing application must be organized in a defined structure presenting nonclinical pharmacology, pharmacokinetic and toxicology study reports and summaries, following a harmonized format that allows the same core nonclinical safety data package to support applications across multiple ICH regions, complementing the Quality module structure described in ICH M4Q.

Paraphrased for plain-language clarity. Always verify against the current published regulation text.

What it means in practice

• While this module's content is nonclinical rather than manufacturing-focused, its harmonized structure means regulatory and quality teams working on a submission need to understand how nonclinical safety findings connect to and support the Quality module's claims about impurity qualification and specification setting.
• Toxicology findings organized under this module frequently set the qualification thresholds that later inform impurity specification limits established under ICH Q3A through Q3E.
• Because the Safety module format is harmonized across regions, inconsistencies between what is presented here and what the Quality module claims about a drug substance's impurity profile can create cross-module review questions.

What inspectors look for

• Whether impurity qualification thresholds referenced in the Quality module are actually consistent with the toxicology data presented in the Safety module.
• Whether nonclinical safety findings that could affect manufacturing-related quality attributes, such as a genotoxic impurity concern, are reflected consistently in the application's quality control strategy.
• Whether updates to nonclinical safety information following initial approval were evaluated for any resulting impact on quality specifications.

Related regulations