RxNorm Help

RxNorm is a standardized nomenclature for clinical drugs. The RxNorm name of a clinical drug combines its ingredients, strengths, and form in which the drug is administered or is specified to be administered in a prescription or order. RxNorm standard names for clinical drugs are connected to the varying names of drugs present in many different controlled vocabularies within the UMLS Metathesaurus, including commercial drug information sources.

This filter extracts from the Metathesaurus only those concepts that participate in the RxNorm graph of connections; that is, only concepts that meet one of the following criteria:

  1. RxNorm atoms, e.g., SCD
  2. HL7 dose form atoms (TTY=DF), or
  3. Semantic Type = Drug Delivery Device.
The RxNorm default subset includes only RxNorm concepts from sources at restriction level 0. You may further customize your RxNorm subset by using the Source List tab to add or remove other sources that may include RxNorm concepts.

For more information on RxNorm:
http://www.nlm.nih.gov/research/umls/rxnorm/index.html