Look up drug names, RxCUIs, ingredients and interactions in RxNorm. Hosted by usefulapi — connect from Claude, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"rxnorm": {
"url": "https://rxnorm.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"rxnorm": {
"type": "http",
"url": "https://rxnorm.usefulapi.io/mcp"
}
}
}Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see Before you connect.
You do not need an account or a key for RxNorm. You log in with your email address and a 6-digit code.
RxNorm needs no credential.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your email address and a 6-digit code. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Turn on the RxNorm connector, then ask in plain words. The AI picks the tools.
| 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. |
rxnorm_usage_status | Usage status (free-tier meter) Report the caller's current free-tier usage this month: calls used, monthly limit, remaining, and whether the cap is reached. Read-only; does not count against the meter. | |
rxnorm_request_feature | Request a missing feature Tell usefulapi that the user needs something the RxNorm tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. | |
rxnorm_upgrade | Upgrade to Pro (unlimited) Subscribe to the Pro plan for UNLIMITED RxNorm tool calls (the free tier caps monthly usage). Choose monthly ($9/month) or yearly ($90/year — 2 months free) billing. Returns a Stripe Checkout link to open in your browser; after payment your account upgrades automatically. Does not count against the meter. | |
rxnorm_cancel_subscription | Cancel the Pro subscription Cancel the caller's RxNorm Pro subscription at the end of the paid period (no refund for the current period; unlimited calls continue until then, then the free tier applies). Requires confirm: true. Run rxnorm_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 100 tool calls / month |
| Pro | $9/mo · $90/yr | Unlimited |
Pro covers this RxNorm server only. Subscribe with rxnorm_upgrade (it returns a Stripe Checkout link). Cancel any time with rxnorm_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running rxnorm_upgrade before then undoes the cancel. Or write to [email protected].
No. usefulapi is an independent service. It is not affiliated with or endorsed by RxNorm. The server calls the public RxNorm API for you.
Only an email address. You do not need a key for RxNorm.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your email address and a 6-digit code. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
All 13 RxNorm tools are marked read-only.
The Free plan gives 100 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls, for this RxNorm server only. Run rxnorm_usage_status to see how many calls you used.
Ask the AI to run rxnorm_upgrade: it returns a Stripe Checkout link. To cancel, run rxnorm_cancel_subscription. Pro continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with rxnorm_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, Cursor, VS Code, Windsurf and others.
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.