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Course Introduction & Overview

What is this course about?

Who is the mini-course for?

Teaching goals (10)

Copy of Teaching goals (10)

Classification of Solvents by Toxicity (Class 1, 2, 3)

SLIDE 1 — Opening Hook (45 sec)

SLIDE 2 — Concept Simplified (60 sec)

SLIDE 3 — Case Study with Characters & Dialogue (90 sec)

SLIDE 4 — Practical Application (60 sec)

Audit Readiness and Key Takeaways

10 Key Concepts from the Entire Training Package

Copy of 10 Key Concepts from the Entire Training Package

10-Point Audit / Inspection Checklist

Quiz

Part A — Quiz (5 scenario-based MCQs)

Survey / Feedback

Part B — Reflection

Part C — Top 5 Takeaways

Welcome to the definitive guide on the Classification of Residual Solvents by Toxicity Under ICH Q3C(R9). In pharmaceutical manufacturing, the control of residual solvents is not just a regulatory hurdle—it is a critical patient safety and toxicological hazard issue.

Welcome to the definitive guide on the Classification of Residual Solvents by Toxicity Under ICH Q3C(R9). In pharmaceutical manufacturing, the control of residual solvents is not just a regulatory hurdle—it is a critical patient safety and toxicological hazard issue. This comprehensive mini-course is designed to demystify the ICH Q3C(R9) guidelines, providing you with a clear, actionable understanding of how to classify, limit, and justify the presence of residual solvents in your pharmaceutical products. Whether you are dealing with untested carryover from upstream steps or introducing a new synthetic route, understanding the risk-tiering of Class 1, Class 2, and Class 3 solvents is essential to preventing avoidable regulatory inspection findings. Throughout this course, you will explore the fundamental concepts of Permitted Daily Exposure (PDE) and No Observed Effect Level (NOEL), dive into realistic case studies with practical dialogues, and learn how to apply these rules to real-world manufacturing scenarios. By the end of this training, you will be equipped with a 10-point audit and inspection checklist to ensure your processes and regulatory dossiers are fully compliant and audit-ready. Join us to master the principles of risk-tiering by toxicological hazard and safeguard both product quality and patient safety.

125. Classification of Residual Solvents by Toxicity Under ICH Q3C(R9)

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            <p>The control of residual solvents in pharmaceutical manufacturing is a critical component of ensuring patient safety and product quality. Under the ICH Q3C(R9) guideline, residual solvents are evaluated and categorized strictly based on their toxicological hazards. Because these volatile organic chemicals provide no therapeutic benefit, their presence in final drug products, excipients, or starting materials must be carefully managed and scientifically justified. This course establishes a foundational understanding of how solvents are classified into distinct risk tiers—specifically Class 1, Class 2, and Class 3—and introduces fundamental toxicological concepts such as Permitted Daily Exposure (PDE) and No Observed Effect Level (NOEL), requiring no prior expertise in toxicology.</p>

<p>Designed for professionals across Quality Assurance, Quality Control, Manufacturing, Validation, Regulatory Affairs, and Engineering, this curriculum bridges the gap between regulatory guidelines and daily operational compliance. Participants will explore the practical implications of solvent selection and control, scaling from the ability of operators to recognize high-risk Class 1 solvents on the manufacturing floor, to the capacity of subject matter experts to justify PDE limits in regulatory dossiers. By examining realistic case studies, calculating exposure limits, and reviewing a comprehensive 10-point audit checklist, personnel will be equipped to identify untested carryover, implement appropriate control strategies, and ensure robust inspection readiness across all stages of pharmaceutical production.</p>
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