Look up drug names, RxCUIs, ingredients and interactions in RxNorm. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the RxNorm connector, then ask in plain words. The AI picks the tools.
For pharmacy staff, health software developers and analysts who work with drug names and codes in RxNorm.
The AI searches a drug name and returns matching RxNorm concept ids (RxCUIs) and drug products grouped by concept type. You get the right code for a name and strength.
The AI gets spelling suggestions and fuzzy matches for a term with typos or abbreviations. It then finds the intended drug.
The AI looks up the drug classes that contain a drug by name, and the drugs that belong to a class.
The AI gets the NDCs linked to a drug concept, for example for one tablet or capsule strength.
The AI gets the concepts related to a drug by term type, such as ingredient or brand name, or all related concepts. It also reads a concept's status and history.
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.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
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"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
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.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+ | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this RxNorm server only. Ask your AI to run rxnorm_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with rxnorm_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with rxnorm_upgrade before then undoes the cancel. Or write to [email protected].
rxnorm_find_rxcui_by_namerxnorm_get_drugsrxnorm_get_concept_propertiesrxnorm_get_related_by_typerxnorm_get_all_relatedrxnorm_get_ndcsrxnorm_get_history_statusrxnorm_get_propertyrxnorm_get_spelling_suggestionsrxnorm_get_approximate_matchrxnorm_get_term_typesrxnorm_get_drug_classesrxnorm_get_class_membersrxnorm_usage_statusrxnorm_request_featurerxnorm_upgraderxnorm_cancel_subscriptionFind the standard code for a drug. Fix a misspelled drug name. Find a drug's class and the drugs in a class. List the national drug codes of a product. Explore related concepts and check status and history. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by RxNorm. The server calls the public RxNorm API for you.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
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 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this RxNorm server only. Cancel any time: your paid plan then runs to the end of the paid period. Run rxnorm_usage_status to see how many calls you used.
Ask the AI to run rxnorm_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run rxnorm_cancel_subscription. Your paid plan 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, ChatGPT, Codex, 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.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.