SOAP access to the APIs is deprecated as of July 2019 and will be terminated in January 2020. Please consider using the REST APIs instead.
  • RxNav

    RxNav is a browser for several drug information sources, including RxNorm and RxTerms. RxNav finds drugs in RxNorm from the names and codes in its constituent vocabularies.

    rxnav formview image rxnav simplified image pill image status view atc class view
  • APIs

    Application Program Interfaces (APIs) are available to users to retrieve data from several drug information sources, including RxNorm and RxTerms.

    Currently there are six APIs available - RxNorm, Prescribable RxNorm, RxClass, RxTerms, RxCUI History and Drug Interaction

    Other API graph Aug 2015 rxnormapi call function April 2018
  • RxMix

    RxMix is a web application that allows users to combine functions from eight different APIs to create custom applications that can be run interactively or in a batch mode.

    rxmix flow image rxmix output image
  • RxClass

    The RxClass Browser is a web application for exploring and navigating through the class hierarchies to find the RxNorm drug members associated with each class.

    rxclass browser image rxclass selection image rxclass Venn diagram

RxNav brand names


RxNav-in-a-Box provides users with a locally-installable version of RxNav and companion RESTful APIs, including RxNorm, RxTerms, RxClass and drug-drug interactions. A beta version is now available for users to download. Details

More RxNav News

SNOMED CT classes added to RxClass

In October 2019, SNOMED CT was added to RxClass and the RxClass API as a drug classification system, along with ATC, the MED-RT system, MeSH pharmacologic actions and the VA (VANDF) classes. SNOMED CT contributes two new class types, “disposition” (similar to mechanism of action), and (chemical) structure. SNOMED CT also provides a source of drug-class relations for these classes. (Therapeutic role classes from SNOMED CT are not integrated into RxClass.) We are grateful to SNOMED International for making the SNOMED CT drug classes available to RxClass and the RxClass API.

Farewell, SOAP

As API users gravitate to RxNav's REST APIs for performance and convenience, the SOAP service has fallen behind feature parity. SOAP access to the APIs is deprecated as of July 2019 and will be terminated in January 2020. SOAP API users are encouraged to switch to the REST APIs. Please give us feedback at RXNAVINFO@LIST.NIH.GOV.

API Usage RxNav Usage REST vs SOAP Usage
By Year: 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011