That part of quality assurance that ensures that the quality of pharmaceutical product is maintained by means of adequate control of the numerous activities which occur during the distribution process as well as providing a tool to secure the distribution system from counterfeits, unapproved, illegally imported, stolen counterfeit, substandard, adulterated, and/or misbranded pharmaceutical products.

Good Distribution Practice (GDP) is that part of quality assurance which ensures that products are consistently stored, transported and handled under suitable condition as required by the marketing authorisation (MA) or product specification.