Good manufacturing practice (GMP) is that part of quality assurance which ensures that products are consistently produced and controlled to quality standards appropriate to their intended use and as required by the marketing authority. GMP rules are directed primarily at diminishing the risks inherent in any pharmaceutical production that cannot be prevented completely through the testing of final products.

All procedures for the manufacture of herbal medicine under regulation should be in accordance with GMP. WHO Good manufacturing practices for pharmaceutical products and Good manufacturing practices: supplementary guidelines for the manufacture of herbal medicinal products may be consulted when the GMP for an individual country is prepared.

A phased approach to the implementation of GMP may be required.