RxClass API


Information returned
Drug or class names similar to a given string
Service domain
HTTP request
GET  /REST/rxclass/spellingsuggestions.xml?type=value&term=value


Get spelling suggestions for a given drug or class name (the name parameter). Select "drug" or "class" with the type parameter.

The suggestions are class or class-member names, listed in decreasing order of closeness to the original phrase.



Notation for results

One of:
Get results in XML
Get results in JSON
typeQueryOptionalScope of search
One of:
Suggest drug-name spellings
Suggest class-name spellings
termQueryRequiredPossibly misspelled name

All query parameters are case-insensitive.

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 rxclassdata. It is described in the XML Schema for the RxClass 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 rxclassdata. 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
suggestion (array)
Class or drug name

Example: Classes like "marcolides"

XML: https://rxnav.nlm.nih.gov/REST/rxclass/spellingsuggestions?term=marcolides&type=CLASS

JSON: https://rxnav.nlm.nih.gov/REST/rxclass/spellingsuggestions.json?term=marcolides&type=CLASS

An XML result is shown below.