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GET /v1/approximate

Spelling-tolerant drug search

Try it live

10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/rxnorm-api

It works. Grab an API key and use it in your project.

Get an API key

Code snippets

curl "https://api.oanor.com/rxnorm-api/v1/approximate" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/rxnorm-api/v1/approximate", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/rxnorm-api/v1/approximate");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/rxnorm-api/v1/approximate",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "term": "ibuprfen",
        "count": 1,
        "candidates": [
            {
                "rank": "1",
                "rxcui": "5640",
                "score": 7.62
            }
        ]
    },
    "meta": {
        "timestamp": "2026-06-01T08:13:55.995Z",
        "request_id": "e2191531-d84e-421a-972a-4ec82e5db30b"
    },
    "status": "ok",
    "message": "Candidates retrieved",
    "success": true
}