RXNORM CONCEPT NAMES AND SOURCES (129.2)    FILE (1)

RxNorm is a standardized nomenclature for clinical drugs.  RxNorm is
Medical Language System (UMLS). Some of the Metathesaurus fields are not
provided by RxNorm and are marked as "(no value provided)". There is
exactly one row in this file for each atom (each occurrence of each unique
string or concept name within each source vocabulary) in RxNorm, i.e.,
there is exactly one row for each unique RXAUI in RxNorm. Every string or
concept name in RxNorm appears in this file, connected to its language,
source vocabularies, and its concept identifier (RXCUI).
produced by the National Library of Medicine (NLM).  In this context, 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 Concept Names and Sources file contains a subset of the data
distributed by NLM in the RXNCONSO.RRF file. This file follows the general
format of the MRCONSO.RRF file of the Metathesaurus in NLM's Unified