Defined Daily Dose (DDD) is a standardized statistical measure representing the assumed average daily dose of a drug used for its main adult indication.
DDD is widely used to normalize drug utilization comparisons across populations, products, and time periods. In research analyses, DDD can support exposure comparisons, utilization metrics, and contextual safety evaluations. It provides a consistent reference point but does not replace protocol-defined dosing in clinical studies. Standardized dosing concepts improve interpretability and comparability of drug exposure reporting.