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Quality by design (QbD) encourages the pharmaceutical industry to use risk management and science-based manufacturing principles to gain process and product understanding and thus assures quality of the product. With the objective to curb the rising costs for development and regulatory barriers to innovation and creativity, QbD is being widely promoted by Food and Drug Administration (FDA) and International Conference on Harmonization (ICH). Areas covered: This review describes the elements, different design and tools of QbD as well as multidimensional applications of QbD ranging from dosage form and method development to meeting latest regulatory requirements. Expert opinion: The understanding of a process is facilitated by proper identification of sources of variation, management of variability by process design, and prediction of product quality attributes using design space. The pharmaceutical industry is rapidly adopting the QbD principles for fabrication of safe, effective and quality products; however, we are still on a journey and the process of gathering all experience and metrics required for connecting and demonstrating QbD benefits to all stakeholders is still in progress. Understanding the formulation and process parameters with the philosophy of QbD will be useful for the optimization of complex drug delivery systems in the near future.

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