RxNorm Drug Names
RxNorm from the U.S. National Library of Medicine via RxNav. RxNorm content only (no SNOMED CT, no other source vocabularies). Identification and normalisation only: no interaction checks, not medical advice.
- cost
- Free every endpoint, within the daily allowance
- after that
- from $0.001 / call · card or USDC
- endpoints
- 8
No signup needed over MCP: 100 free calls a day, or 500 with a free key.
Drug name to RxCUI Free
Exact (normalised) match of a drug name to its RxNorm concept id(s).
- cost
- Free then $0.001 / call
- MCP tool
- rxnorm__rxcui
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/rxcui
| Param | Type | Description |
|---|---|---|
| name | string | Drug name (ingredient or brand) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/rxcui?name=atorvastatin" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/rxcui?name=atorvastatin"
by fourzerotwo
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Approximate drug match Free
Ranked RxNorm candidates for a misspelled or partial drug name.
- cost
- Free then $0.002 / call
- MCP tool
- rxnorm__approximate
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/approximate
| Param | Type | Description |
|---|---|---|
| term | string | Drug name, possibly misspelled |
| limit? | integer | Max candidates (1-20) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/approximate?term=ibuprofn" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/approximate?term=ibuprofn"
by fourzerotwo
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Spelling suggestions Free
Correctly spelled RxNorm drug names close to the input.
- cost
- Free then $0.001 / call
- MCP tool
- rxnorm__spelling
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/spelling
| Param | Type | Description |
|---|---|---|
| name | string | Drug name as typed |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/spelling?name=amoxicilin" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/spelling?name=amoxicilin"
by fourzerotwo
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Clinical & branded drugs Free
Every clinical drug, branded drug and pack for an ingredient or brand name, grouped by RxNorm term type.
- cost
- Free then $0.002 / call
- MCP tool
- rxnorm__drugs
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/drugs
| Param | Type | Description |
|---|---|---|
| name | string | Drug name (ingredient or brand) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/drugs?name=atorvastatin" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/drugs?name=atorvastatin"
by fourzerotwo
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Concept properties Free
Name, synonym, term type and active/obsolete status of an RxCUI.
- cost
- Free then $0.001 / call
- MCP tool
- rxnorm__properties
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/properties
| Param | Type | Description |
|---|---|---|
| rxcui | string | RxNorm concept id (RxCUI) |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/properties?rxcui=83367" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/properties?rxcui=83367"
by fourzerotwo
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NDC to RxCUI Free
National Drug Code (10 or 11 digits) to its RxNorm concept and status.
- cost
- Free then $0.001 / call
- MCP tool
- rxnorm__ndc
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/ndc
| Param | Type | Description |
|---|---|---|
| ndc | string | NDC with or without hyphens |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/ndc?ndc=00071015523" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/ndc?ndc=00071015523"
by fourzerotwo
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NDCs for an RxCUI Free
Active National Drug Codes for an RxNorm clinical or branded drug.
- cost
- Free then $0.001 / call
- MCP tool
- rxnorm__ndcs
- method
- GET
Free up to 100 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/rxnorm/ndcs
| Param | Type | Description |
|---|---|---|
| rxcui | string | RxCUI of a clinical/branded drug |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/rxnorm/ndcs?rxcui=617314" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/rxnorm/ndcs?rxcui=617314"
by fourzerotwo
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This product uses publicly available data from the U.S. National Library of Medicine (NLM), National Institutes of Health, Department of Health and Human Services; NLM is not responsible for the product and does not endorse or recommend this or any other product. Not medical advice.