usefulapi

RxNorm MCP server. Look up drug names, RxCUIs, ingredients and interactions in RxNorm.

Claude

Open Settings → Connectors → Add custom connector
Paste this URL:
https://rxnorm.usefulapi.io/mcp
Authenticate with RxNorm when prompted

Cursor · VS Code · Windsurf · Cline

Add to your MCP config, then reload & authorize:

{
  "mcpServers": {
    "rxnorm": {
      "url": "https://rxnorm.usefulapi.io/mcp"
    }
  }
}

live13 toolsFree 100 tool calls / monthPro $9/mo · $90/yr

Tools 13

Tool	Type	What it does
`rxnorm_find_rxcui_by_name`	read	Find RxCUI by name Find RxNorm concept IDs (RxCUIs) matching a drug name string. RxNav REST: GET /rxcui.
`rxnorm_get_drugs`	read	Search drugs by name Search drug products (all term types) matching a name, grouped by concept type. RxNav REST: GET /drugs.
`rxnorm_get_concept_properties`	read	Get concept properties Get the RxNorm properties (name, synonym, tty, language, suppress, umlscui) of a concept. RxNav REST: GET /rxcui/{rxcui}/properties.
`rxnorm_get_related_by_type`	read	Get related concepts by type Get concepts related to a concept, restricted to the specified term types. RxNav REST: GET /rxcui/{rxcui}/related.
`rxnorm_get_all_related`	read	Get all related concepts Get every concept directly or indirectly related to a concept (all term types). RxNav REST: GET /rxcui/{rxcui}/allrelated.
`rxnorm_get_ndcs`	read	Get NDCs for a concept Get the NDCs (National Drug Codes) associated with a concept. RxNav REST: GET /rxcui/{rxcui}/ndcs.
`rxnorm_get_history_status`	read	Get concept history / status Get the status, history and attributes of a concept (active, remapped, quantified, etc). RxNav REST: GET /rxcui/{rxcui}/historystatus.
`rxnorm_get_property`	read	Get concept property Get a named property (category, name, value) of a concept, e.g. ATC code or a synonym. RxNav REST: GET /rxcui/{rxcui}/property.
`rxnorm_get_spelling_suggestions`	read	Get spelling suggestions Get spelling suggestions for a possibly-misspelled drug name. RxNav REST: GET /spellingsuggestions.
`rxnorm_get_approximate_match`	read	Approximate term match Fuzzy match a term against RxNorm names — tolerant of abbreviations, misspellings, and extra words. RxNav REST: GET /approximateTerm.
`rxnorm_get_term_types`	read	List term types List all RxNorm term types (metadata), e.g. SCD, SBD, IN, BN. RxNav REST: GET /termtypes.
`rxnorm_get_drug_classes`	read	Get drug classes for a drug Get the drug classes that contain a drug, by drug name (RxClass API). RxNav REST: GET /rxclass/class/byDrugName.
`rxnorm_get_class_members`	read	Get drug class members Get the drugs belonging to a drug class (RxClass API). RxNav REST: GET /rxclass/classMembers.

Pricing

Plan	Price	Limit
Free	$0	100 tool calls / month
Pro	$9/mo · $90/yr	Unlimited

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.