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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

May Release - 05/02/2011

This release of RxNorm is consistent with the 2010AB UMLS Metathesaurus release. For additional information about RxNorm releases, including scripts for loading the RxNorm data into Oracle and MySQL databases, read the RxNorm Documentation.


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

Source NameSABDate Updated
Gold Standard Alchemy GS 04/03/2011
Medi-Span Master Drug Data Base MDDB 04/06/2011
Multum MediSource Lexicon MMSL 04/01/2011
Micromedex RED BOOK MMX 04/15/2011
FDA National Drug Code Directory MTHFDA 04/01/2011
FDA Structured Product Labels MTHSPL 04/25/2011
First DataBank NDDF Plus Source Vocabulary NDDF 04/20/2011
Veterans Health Administration National Drug File - Reference Terminology NDFRT 05/02/2011
Veterans Health Administration National Drug File VANDF 03/27/2011


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

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 08/30/2010
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2011


Data Changes

Beginning with the May release, RxNorm will include relationships between RxNorm forms with the same ingredient(s), whether base or precise, and dose forms in the same named group. This bidirectional relationship, which has the attribute (RELA) "has_related_form", will link SCDs to SCDs and SBDs to SBDs. For more information, including examples and a list of the groups, visit this link: //

Data Counts

Term Type or AttributeNumber
Active GPCK forms 308
Active BPCK forms 394
Active SCD forms 19,340
Active SBD forms 16,622
Active RXNORM MIN atoms 3,649
Active RXNORM IN atoms 4,970
Active RXNORM PIN atoms 1,554
Active RXNORM BN atoms 15,128
Active RXNORM DF atoms 101
Obsolete GPCK forms 62
Obsolete BPCK forms 28
Obsolete SCD forms 13,913
Obsolete SBD forms 4,059
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 54
OCD atoms 278,946
Source-asserted NDC codes 797,644
Distinct Source-asserted NDC codes 429,291
SAB=RXNORM NDC codes 232,873
Distinct SAB=RXNORM NDC codes 232,873

Last Reviewed: May 2, 2011