The RxNorm API is a web service for accessing the current RxNorm data set. With one exception, no license is needed to use the RxNorm API. This is because the data returned from the API is from the RxNorm vocabulary, a non-proprietary vocabulary developed by the National Library of Medicine.

The API can be accessed by clients in two different ways:

• RxNorm RESTful web services
• RxNorm SOAP web services

Please check RxNorm API changes for the current updates.

Functions and Resources

In the table, the base URI ( https://rxnav.nlm.nih.gov/REST/ ) for the REST resources has been omitted to improve readability.

SOAP Function	REST resource	Description
filterByProperty	/rxcui/{rxcui}/filter	Filter by property
findRxcuiById	/rxcui?idtype	Search by identifier to find RxNorm concepts
findRxcuiByString	/rxcui?name	Search by name to find RxNorm concepts
getAllClasses	/classes	TO BE DEPRECATED. Use the RxClass API functions to return the drug class concepts for the specified drug vocabulary
getAllConceptsByTTY	/allconcepts	Return the RxNorm concepts for the specified term types
getAllHistoricalNDCs	/rxcui/{rxcui}/allhistoricalndcs	Return all National Drug Codes (NDC) for a concept
getAllNDCs	/rxcui/{rxcui}/allndcs	TO BE DEPRECATED. Use getAllHistoricalNDCs or /rxcui/{rxcui}/allhistoricalndcs instead.
getAllProperties	/rxcui/{rxcui}/allProperties	Return all properties for a concept
getAllRelatedInfo	/rxcui/{rxcui}/allrelated	Return all related concept information
getApproximateMatch	/approximateTerm	Approximate match search to find closest strings
getClassHierarchy	/rxcui/{rxcui}/hierarchy	TO BE DEPRECATED. Use the RxClass API functions to return drug class information
getClassMembers	/members	TO BE DEPRECATED. Use the RxClass API functions to return drug class members
getDisplayTerms	/displaynames	Return the auto suggestion names
getDrugs	/drugs	Return the related drugs
getIdTypes	/idtypes	Return the available identifier types
getMultiIngredBrand	/brands	Return the brands containing the specified ingredients
getNDCs	/rxcui/{rxcui}/ndcs	Return all National Drug Codes (NDC) for a concept
getNDCProperties	/ndcproperties	Return National Drug Code (NDC) properties
getNDCStatus	/ndcstatus	Return the status of a National Drug Code (NDC)
getPropCategories	/propCategories	Return the property categories.
getPropNames	/propnames	Return the property names.
getProprietaryInformation	/rxcui/{rxcui}/proprietary	Return the proprietary information for a concept
getRelatedByRelationship	/rxcui/{rxcui}/related?rela	Return the related concepts of specified relationship types
getRelatedByType	/rxcui/{rxcui}/related?tty	Return the related concepts of specified term types
getRelaTypes	/relatypes	Return the available relationship types
getRxConceptProperties	/rxcui/{rxcui}/properties	Return the concepts properties
getRxcuiStatus	/rxcui/{rxcui}/status	Return the status of the concept
getRxNormVersion	/version	Return the RxNorm data set version
getRxProperty	/rxcui/{rxcui}/property	Return the value of a concept property
getSourceTypes	/sourcetypes	Return the available vocabulary abbreviated source types
getSpellingSuggestions	/spellingsuggestions	Return spelling suggestions for a name
getTermTypes	/termtypes	Return the available term types

Note: Please check the Terms of Service for restrictions on using the APIs.

Deprecated Functions

SOAP Function	REST resource	Description
approxMatch	/approx	DEPRECATED. Use getApproximateMatch (SOAP) or /approximateTerm (REST)
findRemapped	/remap/{rxcui}	DEPRECATED. Use getRxcuiStatus (SOAP) or /rxcui/{rxcui}/status (REST)
getQuantity	/rxcui/{rxcui}/quantity	DEPRECATED. Use getRxProperty (SOAP) or /rxcui/{rxcui}/property (REST)
getSplSetId	/rxcui/{rxcui}/splsetid	DEPRECATED. Use getRxProperty (SOAP) or /rxcui/{rxcui}/property (REST)
getStrength	/rxcui/{rxcui}/strength	DEPRECATED. Use getRxProperty (SOAP) or /rxcui/{rxcui}/property (REST)
getUNII	/rxcui/{rxcui}/unii	DEPRECATED. Use getRxProperty (SOAP) or /rxcui/{rxcui}/property (REST)