| DESCRIPTION |
RxNorm is a standardized nomenclature for clinical drugs. RxNorm is
System (UMLS). Some of the Metathesaurus fields are not provided by RxNorm
and are marked as "(no value provided)". There is one row in this table
for each relationship between concepts or atoms known to RxNorm. In
addition, explicit SY RELs are provided which give the UMLS Metathesaurus
CUI and AUI as the RXCUI2 and RXAUI2 fields.
Note that for asymmetrical relationships there is one row for each
direction of the relationship. Note also the direction of REL - the
relationship which the SECOND concept or atom (with Concept Unique
Identifier RXCUI2 and Atom Unique Identifier (RXAUI2) HAS TO the FIRST
produced by the National Library of Medicine (NLM). In this context,
concept or atom (with Concept Unique RXCUI1 and Atom Unique Identifier
RXAUI1).
a clinical drug is a pharmaceutical product given to (or taken by) a
patient with a therapeutic or diagnostic intend. The name of the drug in
RxNorm combines its ingredients, dosage strength, and form.
The RxNorm Related Concepts file contains a subset of the data distributed
by NLM in the RXNREL.RRF file. This file follows the general format of the
MRREL.RRF file of the Metathesaurus in NLM's Unified Medical Language
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