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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

August Release - 8/03/2020

This full release of RxNorm is consistent with the 2020AA 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 with version names in bold have been updated since the previous RxNorm release:

Source NameSABVersion
DrugBank DRUGBANK DRUGBANK5.0_2020_07_02
Gold Standard Drug Database GS GS_2020_07_13
Multum MediSource Lexicon MMSL MMSL_2020_07_01
Micromedex RED BOOK MMX MMX_2020_07_13
FDA Structured Product Labels MTHSPL MTHSPL_2020_07_24
FDB MedKnowledge (formerly NDDF Plus) NDDF NDDF_2020_07_15
RxNorm normalized names and codes RXNORM RXNORM_20AA_200803F
Veterans Health Administration National Drug File VANDF VANDF_2020_06_30

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

Source NameSABVersion
Anatomical Therapeutic Chemical Classification System ATC ATC_2020
Vaccines Administered CVX CVX_2020_05_11
Medical Subject Headings (MeSH) MSH MSH2020_2020_01_15
CMS Formulary Reference File MTHCMSFRF MTHCMSFRF_2014
US Edition of SNOMED CT (drug information) SNOMEDCT_US SNOMEDCT_US_2020_01_31
USP Compendial Nomenclature USP USP_2020_02_06

*Reminder: As of October 2017, Medi-Span data will not be included in the RxNorm or UMLS releases. If you have questions about Medi-Span, please contact:

Data Changes

New Qualitative Distinction

Qualitative Distinction (QD) modifiers allow flexibility in the RxNorm model to create a new RxNorm Concept Unique Identifier (RXCUI) or differentiate an existing medication concept when needed. The August 2020 release includes the new QD “Twice-Daily” for the following active concepts:

855626 SCD Twice-Daily diclofenac epolamine 0.013 MG/MG Medicated Patch
855628 SBD Twice-Daily diclofenac epolamine 0.013 MG/MG Medicated Patch [Flector]

For each SCD or SBD with a QD, there is an associated attribute in RXNSAT with the attribute name (ATN) of 'RXN_QUALITATIVE_DISTINCTION'. The August release contains the following new attribute value (ATV) to match the QD strings found in the SCD and SBD normalized names:

  • Twice-Daily


Notice of Upcoming Data Changes

As a courtesy to users, this section provides advance notice of possible upcoming RxNorm data changes. More information about each change will be provided or repeated in the future. Please note that planned data changes and timelines may change if issues arise.

Data Counts

Term Type or AttributeNumber
Active GPCKs424
Active BPCKs511
Active SCDs16736
Active SBDs9565
Active RXNORM MINs3729
Active RXNORM INs12839
Active RXNORM PINs3020
Active RXNORM BNs5275
Active RXNORM DFs122
Obsolete GPCKs230
Obsolete BPCKs196
Obsolete SCDs18181
Obsolete SBDs11470
Obsolete RXNORM MINs0
Obsolete RXNORM INs0
Obsolete RXNORM PINs0
Obsolete RXNORM BNs6569
Obsolete RXNORM DFs62
Editor-suppressed SCDs1774
Editor-suppressed SBDs1477
Distinct SAB=RXNORM NDCs233903

Last Reviewed: August 3, 2020