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National Library of Medicine Technical BulletinNational Library of Medicine Technical Bulletin

Table of Contents: 2021 MAY–JUNE No. 440

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RxNorm May 2021 Release

RxNorm May 2021 Release. NLM Tech Bull. 2021 May-Jun;(440):b2.

2021 May 03 [posted]

The RxNorm May monthly release became available for download on Monday, May 3, 2021. See below for upcoming data changes and related news.


No major changes to report for the May 2021 release.

Upcoming RxNorm 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.

BoSS attribute changes and RxNorm Terminology Term Type changes have been delayed.

  • Basis of Strength (BoSS) attributes will change in September 2021 at the earliest
    • Several of the BoSS attributes will change from being present on the SCDC to the SCD
  • New RxNorm Terminology Term Types (TTYs) will be added late fall/early winter 2021 at the earliest
    • RxNorm will add three new TTYs:
      • Semantic Clinical Drug Form Precise (SCDFP)
      • Semantic Clinical Dose Form Group Precise (SCDGP)
      • Semantic Branded Drug Form Precise (SBDFP)


RxMix added to RxNav-in-a-Box

Did you know that RxMix was added to RxNav-in-a-Box? Explore the RxNav landing page for web-based drug information services, such as the RxNorm application programming interface (API), RxClass API, and the Drug Interaction API.

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