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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

November Release - 11/07/2011

This release of RxNorm is consistent with the 2011AA UMLS Metathesaurus release. For additional information about RxNorm releases, including scripts for loading the RxNorm data into Oracle and MySQL databases, read the RxNorm technical documentation.


The following sources have been updated since the previous RxNorm release:

Source NameSABDate Updated
Gold Standard Alchemy GS 10/02/2011
Medi-Span Master Drug Data Base MDDB 10/05/2011
Multum MediSource Lexicon MMSL 10/01/2011
Micromedex RED BOOK MMX 10/03/2011
FDA Structured Product Labels MTHSPL 10/31/2011
First DataBank NDDF Plus Source Vocabulary NDDF 10/05/2011
Veterans Health Administration National Drug File - Reference Terminology NDFRT 11/07/2011
Veterans Health Administration National Drug File VANDF 09/21/2011


The following sources have not been updated since the previous RxNorm release:

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 02/14/2011
FDA National Drug Code Directory MTHFDA 06/01/2011
SNOMED Clinical Terms (drug information) SNOMEDCT 07/31/2011


Data Changes

TTY=BN Human/Vet Attributes:
TTY=BN atoms will no longer carry the RXN_HUMAN_DRUG or RXN_VET_DRUG attributes, which denote drugs that are intended for human and/or veterinary use. These attributes will remain attached to the TTY=SBD atoms that are related to the TTY=BN atoms via the 'ingredient_of/has_ingredient' RELA.

Dose Form Group Relationships:
A few of the relationship attributes (RELA) for the recently-released dose form group term types (TTY) have changed to better reflect the relationships between these types of concepts. The following table includes the updated RELAs:

DF isa DFG
DFG inverse_isa DF
SBDG inverse_isa SBDF
SCDG inverse_isa SCDF

Data Counts

Term Type or AttributeNumber
Active GPCK forms 316
Active BPCK forms 394
Active SCD forms 20,188
Active SBD forms 17,052
Active RXNORM MIN atoms 3,706
Active RXNORM IN atoms 5,001
Active RXNORM PIN atoms 1,569
Active RXNORM BN atoms 15,478
Active RXNORM DF atoms 100
Obsolete GPCK forms 69
Obsolete BPCK forms 40
Obsolete SCD forms 13,216
Obsolete SBD forms 3,891
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 55
OCD atoms 289,433
Source-asserted NDC codes 1,037,022
Distinct Source-asserted NDC codes 487,302
SAB=RXNORM NDC codes 251,564
Distinct SAB=RXNORM NDC codes 251,564

Last Reviewed: November 7, 2011