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The WHO Adverse Reactions Terminology (WHOART) is a dictionary meant to serve as a basis for rational coding of adverse reaction terms. The system is maintained by the Uppsala Monitoring Centre (UMC), the World Health Organization Collaborating Centre for International Drug Monitoring.


  • 32 System-organ classesbody organ groups
  • 180 High level terms for grouping Preferred terms
  • 2085 Preferred terms principal terms for describing adverse reactions
  • 3445 Included terms synonyms to Preferred terms

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