Drug Interaction API


Information returned
Version of the data set(s)
Service domain
HTTP request
GET  /REST/interaction/version.xml


Get the versions of the data sets.

Upcoming Changes On or About January 2, 2024:

The Drug-Drug Interaction API will be discontinued on or about January 2, 2024. RxNav's Interactions tab will also be removed.



Notation for results

One of:
Get results in XML
Get results in JSON

Note that HTTP requires that query parameters be "URL encoded". For full information on URL encoding, please refer to IETF RFC 3986, "Uniform Resource Identifier".

Output structure

Results are available as either XML or JSON.

  • The XML result has the root element interactiondata. It is described in the XML Schema for the Drug Interaction API; the relevant element structure is summarized below. Elements that would be empty might be left out.

  • The JSON result is an object {...}, analogous to the content of the XML interactiondata. Fields that might occur multiple times in the XML are expressed as an array. Fields that would be empty might be null or left out. Numbers are expressed as strings.

Both XML and JSON results follow the same outline:

Root element in XML, or anonymous object in JSON
Interaction-data sources and dataset version
sourceVersion (array)
Source name and data-set version, separated by a colon

Example: Interaction data-set versions

XML: https://rxnav.nlm.nih.gov/REST/interaction/version

JSON: https://rxnav.nlm.nih.gov/REST/interaction/version.json

An XML result is shown below.

    <nlmDisclaimer>It is not the intention of NLM to provide specific medical advice, but rather to provide users with information to better understand their health and their medications. NLM urges you to consult with a qualified physician for advice about medications.</nlmDisclaimer>