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API · /rxnorm-api

RxNorm API

healthy 3,506 Subscribers

US drug terminology as an API, powered by the U.S. National Library of Medicine's RxNav / RxNorm service. Resolve any drug or medication name to its RxNorm concept identifier (RxCUI); read a concept's properties (preferred name, term type, synonym, UMLS id); find all the related drug products for a name grouped by term type (brand names, ingredients, clinical and branded drugs, dose forms); walk related concepts by term type; list the drug classes a medicine belongs to across ATC, VA, mechanism of action, physiologic effect and chemical structure; and run spelling-tolerant search that returns candidate RxCUIs with match scores for misspelled or partial names. The standardised vocabulary that underpins US electronic health records and e-prescribing. Ideal for EHR and pharmacy systems, medication reconciliation, clinical-decision-support and health apps, and drug-data normalisation pipelines. RxCUIs are numeric.

#rxnorm #drugs #medications #terminology #pharmacy #healthcare #reference
api.oanor.com/rxnorm-api
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Machine-readable spec so AI agents can integrate this API.

/api/rxnorm-api/openapi.json
/api/rxnorm-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
272 ms
Server probes · 24h
Subscribers
3,506
active
Total calls
21
last 7 days
status Full status page → · 42 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 560 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 560 calls/month
  • 2 req/sec
  • RxCUI, products & classes
  • No credit card
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Starter

€7.00 /month

  • 20,500 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 20.5k calls/month
  • 8 req/sec
  • Name resolution & products
  • Email support
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Pro

€21.20 /month

  • 91,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 91k calls/month
  • 20 req/sec
  • EHR & e-prescribing
  • Priority support
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Mega

€58.00 /month

  • 352,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 352k calls/month
  • 50 req/sec
  • High-volume medication data
  • Dedicated SLA
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Related APIs

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ATC Drug Classification API

The WHO ATC (Anatomical Therapeutic Chemical) drug classification as an API — 6,400+ codes organising every medicine into a 5-level hierarchy: anatomical main group → therapeutic subgroup → pharmacological subgroup → chemical subgroup → chemical substance. Look up any ATC code (e.g. A10BA02 → metformin, N02BE01 → paracetamol, J01CA04 → amoxicillin) with its full ancestor chain, direct children and WHO Defined Daily Doses (DDD); search drugs by name; or navigate the tree from the 14 anatomical main groups. Ideal for e-prescribing, pharmacy, clinical decision support, drug databases and health analytics.

api.oanor.com/atc-api

FDA Drug API

Look up FDA drug labels — purpose, indications, dosage, warnings and ingredients — the most-reported adverse reactions for a drug (aggregated from FAERS), and FDA recall and enforcement records. Backed by openFDA. Useful for healthcare, pharmacy, telemedicine and drug-information apps. Not medical advice.

api.oanor.com/drug-api

MeSH API

Medical Subject Headings (MeSH) as an API, powered by the U.S. National Library of Medicine's official MeSH RDF service. MeSH is the NLM's authoritative controlled vocabulary used to index the biomedical literature in PubMed — a curated thesaurus of diseases, anatomy, chemicals and drugs, organisms, psychiatry and psychology, analytical and diagnostic techniques, health care and more. Each concept is a "descriptor" with a stable unique id (e.g. D003920), a preferred name, a set of entry terms (synonyms and lay variants), and a list of allowable qualifiers (subheadings such as drug therapy, diagnosis or epidemiology). /v1/search?q=diabetes searches descriptors by their preferred name (match=contains, exact or startswith) and returns each descriptor's id and label. /v1/term?q=heart attack resolves a lay term or synonym to the MeSH descriptor(s) it belongs to, so colloquial language maps onto the controlled vocabulary (heart attack to Myocardial Infarction). /v1/descriptor?id=D003920 returns a descriptor's full record — its preferred name, all entry terms (synonyms), the allowable qualifiers and see-also cross-references, with a link to the MeSH browser. Ideal for biomedical natural-language processing and text mining, tagging and indexing literature, building clinical and research search tools, autocomplete over medical terminology, and mapping free text onto a standard ontology. Data from NLM MeSH (public domain). For drug-specific clinical nomenclature and interactions, see the RxNorm API.

api.oanor.com/mesh-api

Ontology API

Biomedical ontologies as an API, powered by the EBI Ontology Lookup Service (OLS). Search across 280+ curated ontologies — diseases (MONDO), human phenotypes (HP), the Gene Ontology (GO), anatomy (UBERON), cell types (CL), chemistry (ChEBI), experimental factors (EFO), the NCI Thesaurus and many more — to find terms by name; browse the full ontology catalogue with versions and term counts; read any term for its definition, exact synonyms, OBO id, IRI and obsolete status; and walk the class hierarchy through a term's direct parents and children. Ideal for clinical-data harmonisation and coding, biomedical search and autocomplete, knowledge-graph enrichment, annotation and curation pipelines, and research and EHR applications that need standard vocabularies. OBO ids look like MONDO:0005148 or GO:0008150.

api.oanor.com/ontology-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for RxNorm API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call RxNorm API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for RxNorm API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does RxNorm API cost?
RxNorm API has a free tier with 100 calls / month. Paid plans start at €7.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is RxNorm API GDPR-compliant?
All requests to RxNorm API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/rxnorm-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/rxnorm-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/rxnorm-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/rxnorm-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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