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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

July Release - 07/05/2011

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 Documentation.


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

Source NameSABDate Updated
Gold Standard Alchemy GS 06/07/2011
Medi-Span Master Drug Data Base MDDB 06/08/2011
Multum MediSource Lexicon MMSL 06/01/2011
Micromedex RED BOOK MMX 06/06/2011
FDA National Drug Code Directory MTHFDA 06/01/2011
FDA Structured Product Labels MTHSPL 06/27/2011
First DataBank NDDF Plus Source Vocabulary NDDF 06/08/2011
Veterans Health Administration National Drug File - Reference Terminology NDFRT 07/05/2011
Veterans Health Administration National Drug File VANDF 05/24/2011


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

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 02/14/2011
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2011


Data Changes

RxNorm includes a new term type (TTY) - Tall Man Lettering synonym (TMSY) - which can be used to distinguish between commonly confused ingredients and brand names. RxNorm propagates these synonyms to all RxNorm concepts for an ingredient or brand name.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 311
Active BPCK forms 385
Active SCD forms 19,274
Active SBD forms 16,716
Active RXNORM MIN atoms 3,653
Active RXNORM IN atoms 4,978
Active RXNORM PIN atoms 1,556
Active RXNORM BN atoms 15,209
Active RXNORM DF atoms 100
Obsolete GPCK forms 65
Obsolete BPCK forms 43
Obsolete SCD forms 13,764
Obsolete SBD forms 3,985
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 280,563
Source-asserted NDC codes 807,576
Distinct Source-asserted NDC codes 434,390
SAB=RXNORM NDC codes 236,778
Distinct SAB=RXNORM NDC codes 236,778

Last Reviewed: July 5, 2011