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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

April Release - 04/05/2010

This release of RxNorm is consistent with the 2009AB 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 03/07/2010
Medi-Span Master Drug Data Base MDDB 03/03/2010
Multum MediSource Lexicon MMSL 03/01/2010
Micromedex DRUGDEX MMX 03/01/2010
FDA National Drug Code Directory MTHFDA 03/01/2010
FDA Structured Product Labels MTHSPL 03/29/2010
First DataBank NDDF Plus Source Vocabulary NDDF 03/04/2010
Veterans Health Administration National Drug File VANDF 03/04/2010

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

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 08/17/2009
SNOMED Clinical Terms (drug information) SNOMED CT 01/31/2009

Data Changes

A change has been made to SAB="RXNORM" normal forms that include "thyroxine" in their names. "Thyroxine" has been replaced with "levothyroxine sodium" in these normal forms. An example of this transformation is the SBD, "Thyroxine 0.05 MG Oral Tablet [Synthroid]" (RXCUI 311301), which has been changed to "Levothyroxine Sodium 0.05 MG Oral Tablet [Synthroid]" (RXCUI 966247). 

Data Counts

Term Type or AttributeNumber
Active GPCK forms 273
Active BPCK forms 347
Active SCD forms 18,696
Active SBD forms 15,534
Active RXNORM IN atoms 4,833
Active RXNORM PIN atoms 1,522
Active RXNORM BN atoms 13,654
Active RXNORM DF atoms 100
Obsolete GPCK forms 37
Obsolete BPCK forms 14
Obsolete SCD forms 12,871
Obsolete SBD forms 3,986
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 55
OCD atoms 258,675
Source-asserted NDC codes 549,231
Distinct Source-asserted NDC codes 338,210
SAB=RXNORM NDC codes 284,210
Distinct SAB=RXNORM NDC codes 284,210

Last Reviewed: April 5, 2010