Term: Defined Daily Dose (DDD)

Glossary Definition

Last Updated: 2005-11-29


One of four measures of intensity of pharmaceutical use, defined daily dose (DDD) is the assumed average maintenance dose per day for a drug product when used for its major indication in everyday practice. It standardizes the measurement of drug utilization within and between drug entities and can be used to describe drug utilization across a population, and measure various aspects of intensity. A clinical measure can also be calculated. This is a technical unit of measurement and does not necessarily reflect the actual amount or dose used; it is also limited to solid drug forms only. DDDs are assigned per Anatomical Therapeutic Chemical (ATC) Classification 4th level by the WHO Collaborating Centre for Drug Statistics Methodology in Norway.

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