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Thomas olson atc code12/15/2023 ![]() ![]() The WHO International Working Group for Drug Statistics Methodology formally approves all new ATC codes. The Centre also runs regular training courses to assist those working with the system at a national level. ![]() If the content of these guidelines is not sufficient to decide a classification of a specific combination, or if it is necessary to establish a new ATC entry, such problems should be addressed to the WHO Centre in Oslo. The guidelines are prepared in order to facilitate this work and to ensure that different users of the ATC system classify in a consistent way. It is left to the national users of the ATC system to classify combination products based on the principles given in these guidelines. These conditions are set to avoid including in the ATC system too many chemical entities which never become marketed. In some cases, it may be necessary to await a classification until the new medicinal product has been approved in at least one country (especially for substances where it is considered difficult to establish a new 5th level). The manufacturer will usually wish to know about and be involved in an application for an ATC classification and/or DDD assignment for one of their products, particularly if it is a new drug.Ī new chemical entity is normally not included in the ATC system before an application for marketing authorisations is ready for submission in at least one country. It will usually be the manufacturer who has best access to the information required for an application. health authorities, pharmaceutical manufacturers, researchers and other users). If a substance marketed in a country is not included in the latest version of the annually updated ATC classification index, a request for an ATC code may in principle be sent from any user of the system (e.g. Requests and documentation should accordingly be submitted in English. ![]() The official language of the Centre is English. Requests for ATC classification of a medicinal substance should be addressed to the WHO Collaborating Centre for Drug Statistics Methodology in Oslo, Norway ( Application form). Summaries of submissions to, or evaluations from, major regulatory agencies relating to the above are useful, as well as market research data showing the percentage use for the main indications.Īll new entries in the ATC classification system are assigned on request from the users. Useful sources of these data would be approved product information documents from regulatory authorities or proposed product information documents stating that these are not yet approved. Information about therapeutic use, if available.Status concerning marketing authorisation.Proposed ATC classification with justification based on the evidence submitted.Other indications which are licensed or for which licensing is proposed in the future.Main indication as shown in the product information in major countries where it is licensed or submitted for licensing.Pharmacology and mechanism of action and relationships to similar drugs.Chemical structure and relationship to similar drugs.■ can be used for a well-defined but diverse group of ingredients (e.g.The following data should be submitted when requesting an ATC code for a substance: ■ used as Primary ambiguous link, in which ATC Class is represented with a particular group of Ingredients with a common trait ■ hierarchical (applied at the post-processing, gives +1 level of separation) – contains only one Ingredient Group, which is mentioned somewhere in the middle – starts either from the Ingredient Group or the word of combinations ![]() ■ applied to Multicomponent ATC Classes, which names: ■ ATC - RxNorm primary upward connects the 1st Ingredient Groups of Multicomponent ATC Classes to respective Rx/RxN Standard Ingredients ■ the presence of this link is a prerequisite for creating a ‘Maps to’ relationship_id ■ used as a Secondary unambiguous link for ATC Classes with clear and well-defined Ingredient(s) ■ ATC - RxNorm secondary lateral connects the 2nd Active Ingredient OR any subsequent Active Ingredient of a Multicomponent ATC Class to Rx/RxN Standard Ingredient ■ semantically, it is an equivalent to ‘Maps to’ relationship_id, and usually (except for exemptions) has such a pair in concept_relationship ■ used as a Primary unambiguous link for ATC Classes with a clear and well-defined Ingredient – the 1st Active Ingredient of Multicomponent ATC Classes with Standard Ingredients – Monocomponent ATC Classes with their full semantic equivalents in the form of main active Standard Ingredients ■ technically non-hierarchical, however, semantically it resembles the 'Subsumes' relationship_id with the reverse of 'Is a' ■ connects ATC Classes and Drug Products, but not Ingredients ![]()
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