Developing a pharmaceutical process is much more than making a molecule at laboratory scale. As a process moves toward scale-up and manufacturing, challenges related to process safety, impurity control, crystallization, downstream processing, reproducibility, economics, sustainability, and equipment limitations become increasingly important. A robust process requires systematic understanding of reaction pathways, critical process parameters, product quality, process variability, and scale-dependent effects. This article discusses the key considerations in developing pharmaceutical processes that are safe, scalable, reproducible, economical, and capable of consistently delivering the required quality. It also highlights the value of early risk assessment, process understanding, technology transfer, and independent process chemistry expertise in preventing costly problems during scale-up and manufacturing.

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