What actions should be taken if a protocol amendment affects subject safety?

• A. Implement promptly with ethics approval and ensure investigators are informed.
• B. Wait until the next monitoring visit.
• C. Implement without informing investigators.
• D. Postpone indefinitely.

Answer: (C)

When a protocol amendment affects subject safety, the priority is to protect participants and maintain proper oversight. Any change with safety implications should go through the appropriate ethics committee or IRB and, if required by regulations, regulatory authorities before being put into practice. Once the amendment is approved, implement the changes promptly and make sure all investigators and study sites are informed so they can adjust procedures, retrain staff, and update practices accordingly. If the amendment alters what participants must be told or how risks are explained, update the informed consent document and re-consent participants as needed. Delaying safety actions, implementing changes without informing investigators, or postponing indefinitely undermines participant protection and regulatory compliance.