QUALITY BY DESIGN (QBD) AND PROCESS ANALYTICAL TECHNOLOGY (PAT) IN FORMULATION DEVELOPMENT

The pharmaceutical industry has witnessed a paradigm shift from empirical, trial-and-error approaches to systematic, science-based methodologies for drug development. Quality by Design (QbD) and Process Analytical Technology (PAT) represent such modern approaches, focusing on understanding, controlling, and ensuring product quality throughout development and manufacturing. QbD emphasizes a thorough understanding of formulation and process variables to achieve predefined product quality, while PAT provides real-time monitoring and control during manufacturing. This chapter explores the principles, tools, and applications of QbD and PAT in formulation development, highlighting their role in risk mitigation, regulatory compliance, and enhanced product performance.