RxNorm is a standardized nomenclature for clinical drugs. RxNorm is 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 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).
HELP-PROMPT: Answer must be 1-20 characters in length.
DESCRIPTION:
The abbreviation of the source the concept was found in. Some examples of potential sources would be the VA National Drug File (VANDF), National Drug File (NDFRT), RxNorm Concept Library (RXNORM)
HELP-PROMPT: Answer must be 1-50 characters in length.
DESCRIPTION:
"Most useful" source asserted identifier (if the source vocabulary has more than one identifier), or a RxNorm -generated source entry identifier (if the source vocabulary has none.)