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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

March Release - 03/04/2013

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 02/01/2013
Medi-Span Master Drug Data Base MDDB 01/30/2013
Multum MediSource Lexicon MMSL 02/01/2013
Micromedex RED BOOK MMX 02/04/2013
FDA Structured Product Labels MTHSPL 02/26/2013
FDB MedKnowledge (formerly NDDF Plus) NDDF 02/06/2013
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2013


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
Veterans Health Administration National Drug File VANDF 01/15/2013


Data Changes

The active ingredient for extended release drugs formerly listed as metoprolol tartrate has been changed to metoprolol succinate. Previously, the basis of strength substance (BoSS), metoprolol tartrate, was used in the normalized name for these drugs. Beginning with this release, the normalized names will now use metoprolol succinate instead. RXCUIs for these concepts will not change; however, the RXAUIs for the normalized names will change.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 331
Active BPCK forms 408
Active SCD forms 20,011
Active SBD forms 11,995
Active RXNORM MIN atoms 3,810
Active RXNORM IN atoms 8,275
Active RXNORM PIN atoms 2,038
Active RXNORM BN atoms 16,262
Active RXNORM DF atoms 104
Obsolete GPCK forms 102
Obsolete BPCK forms 76
Obsolete SCD forms 13,618
Obsolete SBD forms 8,344
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 51
Editor-suppressed SCD forms 1,060
Editor-suppressed SBD forms 972
OCD atoms 308,215
Source-asserted NDC codes 1,216,507
Distinct Source-asserted NDC codes 544,567
SAB=RXNORM NDC codes 190,557
Distinct SAB=RXNORM NDC codes 190,557

Last Reviewed: March 4, 2013