RxNorm (NLM RxNav)
FreeLiveLast verified 28 Sept 2026
Normalized U.S. drug names and codes: RxCUIs, NDCs, brands, generics and ingredient relationships.
Example request
curl -s 'https://rxnav.nlm.nih.gov/REST/drugs.json?name=cymbalta'
Free tier, in plain English
Free to use with no key. Keep under 20 requests a second per IP; NLM suggests caching results for 12 to 24 hours.
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