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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

April Release - 04/02/2018

This release of RxNorm is consistent with the 2017AB 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 source versions in bold have been updated since the previous RxNorm release:

Source NameSABVersion
Anatomical Therapeutic Chemical Classification System ATC ATC_2018
Vaccines Administered CVX CVX_2018_01_18
DrugBank DRUGBANK DRUGBANK5.0_2018_03_01
Gold Standard Drug Database GS GS_2018_03_02
Multum MediSource Lexicon MMSL MMSL_2018_03_01
Micromedex RED BOOK MMX MMX_2018_03_05
Medical Subject Headings (MeSH) MSH MSH2018_2017_08_11
CMS Formulary Reference File MTHCMSFRF MTHCMSFRF_2014
FDA Structured Product Labels MTHSPL MTHSPL_2018_03_22
FDB MedKnowledge (formerly NDDF Plus) NDDF NDDF_2018_03_07
Veterans Health Administration National Drug File - Reference Terminology NDFRT NDFRT_2018_02_05
US Edition of SNOMED CT (drug information) SNOMEDCT_US SNOMEDCT_US_2018_01_31
Veterans Health Administration National Drug File VANDF VANDF_2018_02_22

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

Data Changes

Qualitative Distinction
Qualitative Distinction modifiers allow flexibility in the RxNorm model to create new RXCUIs as needed. Please see the technical documentation for more information about Qualitative Distinctions (QDs), which were first released in the August 2016 monthly release.

Here are the new concepts with QDs in the April release:

2001564SCDBX Rating 24 HR Methylphenidate Hydrochloride 18 MG Extended Release Oral Tablet
2001565SCDBX Rating 24 HR Methylphenidate Hydrochloride 27 MG Extended Release Oral Tablet
2001566SCDBX Rating 24 HR Methylphenidate Hydrochloride 36 MG Extended Release Oral Tablet
2001568SCDBX Rating 24 HR Methylphenidate Hydrochloride 54 MG Extended Release Oral Tablet

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 April release contains the following new attribute value (ATV) to match the QD strings found in the SCD and SBD normalized names:

  • BX Rating

NDF-RT/MED-RT Reminder (with updated MED-RT information webpage)
The Veterans Health Administration (VHA) replaced its National Drug File-Reference Terminology (NDF-RT) with Medication Reference Terminology (MED-RT) in early March 2018. The last release of NDF-RT is in the RxNorm full March release and will remain in the RxNorm full monthly releases for the next several months. There are no plans to include MED-RT in RxNorm; however, MED-RT will be included in the UMLS Metathesaurus along with RxNorm and its source vocabularies. For information about MED-RT, go to the Federal Medications Terminology webpage.

Data Counts

Term Type or AttributeNumber
Active GPCKs380
Active BPCKs459
Active SCDs18574
Active SBDs10437
Active RXNORM MINs3978
Active RXNORM INs11757
Active RXNORM PINs2749
Active RXNORM BNs6048
Active RXNORM DFs117
Obsolete GPCKs166
Obsolete BPCKs143
Obsolete SCDs16749
Obsolete SBDs10730
Obsolete RXNORM BNs10050
Obsolete RXNORM DFs59
Editor-suppressed SCDs1758
Editor-suppressed SBDs1401
Distinct SAB=RXNORM NDCs239097

Last Reviewed: April 2, 2018