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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

April Release - 04/04/2011

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 03/13/2011
Medi-Span Master Drug Data Base MDDB 03/09/2011
Multum MediSource Lexicon MMSL 03/01/2011
Micromedex RED BOOK MMX 03/07/2011
FDA National Drug Code Directory MTHFDA 03/01/2011
FDA Structured Product Labels MTHSPL 03/28/2011
First DataBank NDDF Plus Source Vocabulary NDDF 03/16/2011
Veterans Health Administration National Drug File - Reference Terminology NDFRT 04/04/2011
Veterans Health Administration National Drug File VANDF 03/04/2011


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

There are no significant data changes for this release.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 305
Active BPCK forms 389
Active SCD forms 19,214
Active SBD forms 16,580
Active RXNORM MIN atoms 3,635
Active RXNORM IN atoms 4,953
Active RXNORM PIN atoms 1,549
Active RXNORM BN atoms 15,045
Active RXNORM DF atoms 101
Obsolete GPCK forms 54
Obsolete BPCK forms 25
Obsolete SCD forms 13,893
Obsolete SBD forms 4,062
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 277,619
Source-asserted NDC codes 789,085
Distinct Source-asserted NDC codes 425,827
SAB=RXNORM NDC codes 230,314
Distinct SAB=RXNORM NDC codes 230,314

Last Reviewed: April 4, 2011