SELECTION OF PARTICLE SIZESeveral approaches have been used by formulation scientists to select the correct particle size of the API used for dosage formulation of a new drug candidate. Current approaches typically include empirical methods combined with mathematical predictions. Trial and error or empirical methods usually involve the production of various particle size ranges of the API followed by formulation into the proposed dosage form. These dosage forms can then be characterized for dissolution, content uniformity , and any other required testing. This approach is often used when significant quantities of API are available, the physical characteristics of API are not fully known, and the dose is not well established. While this method can be used successfully, it is not preferred in today’s environment where bulk-sparing stratrgies are employed and compressed development times are required. The trial and error method tends to be material, equipment, and personnel-intensive
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