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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

April Release - 04/01/2013

This release of RxNorm is consistent with the 2012AB 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 Drug Database GS 03/07/2013
Medi-Span Master Drug Data Base MDDB 03/06/2013
Multum MediSource Lexicon MMSL 03/01/2013
Micromedex RED BOOK MMX 03/04/2013
FDA Structured Product Labels MTHSPL 03/26/2013
FDB MedKnowledge (formerly NDDF Plus) NDDF 03/13/2013
Veterans Health Administration National Drug File VANDF 03/05/2013


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

Source NameSABDate Updated
FDA National Drug Code Directory MTHFDA 06/01/2011
Medical Subject Headings (MeSH) MSH 08/28/2012
Veterans Health Administration National Drug File - Reference Terminology NDFRT 02/04/2013
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2013

Data Changes

This release will include two important changes to brand names:

  • TTY=BN concepts that have no source-provided atoms and do not have relationships to any SUPPRESS=N concepts will now be marked as SUPPRESS=O and will not be included in the Current Prescribable Content subset. Prior to this release, all TTY=BN concepts were marked as SUPPRESS=N. With these data changes, users can easily identify and ignore obsolete TTY=BN concepts.
  • Multi-ingredient branded drugs containing the same ingredients will no longer be differentiated by appending the strengths of each ingredient to the end of the brand name. For example, there will no longer be ‘Percocet 5/325’, ‘Percocet 10/325’, or ‘Percocet 10/650’. The brand name for each of these will simply be ‘Percocet’. Similarly, some extra words or letters (e.g., PE, Forte, etc.) that are not neccesary to distinguish between two drugs were dropped from the end of brand names. These data changes will be propagated throughout the RxNorm graph, so all related branded concepts (TTY=BN/SBD/SBDC/SBDF/SBDG) will reflect the same brand name. These data changes are meant to reduce the complexity of using RxNorm for allergy reporting by providing a single brand name for drugs containing the same ingredients.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 334
Active BPCK forms 409
Active SCD forms 20,070
Active SBD forms 12,016
Active RXNORM MIN atoms 3,822
Active RXNORM IN atoms 8,422
Active RXNORM PIN atoms 2,050
Active RXNORM BN atoms 7,550
Active RXNORM DF atoms 104
Obsolete GPCK forms 102
Obsolete BPCK forms 76
Obsolete SCD forms 13,602
Obsolete SBD forms 8,318
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 7,925
Obsolete RXNORM DF atoms 51
Editor-suppressed SCD forms 1,061
Editor-suppressed SBD forms 973
OCD atoms 308,705
Source-asserted NDC codes 1,223,110
Distinct Source-asserted NDC codes 547,427
SAB=RXNORM NDC codes 191,614
Distinct SAB=RXNORM NDC codes 191,614

Last Reviewed: April 1, 2013