Quality by Design (QbD) is a new pharmaceutical development paradigm in which products are designed to take account of the disease and its impact on the patient; the patient population; the drug properties; the preferred route of administration (from a clinical and a marketing perspective); and the requirements of the organisation manufacturing the product. In many cases the preferred dosage form will be an oral solid dosage form (OSD), usually tablets which are relatively cheap to manufacture and administer, and can be produced with a wide range of properties.

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