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RxNorm (RxNav)

Medical & Drug Info No key

AuthenticationNo key
Rate limit20 requests per second per IP address.

Documentation: lhncbc.nlm.nih.gov ยท Checked Sep 13, 2026

About

RxNorm is the National Library of Medicine's service that turns messy drug names into standard, official identifiers. Type something like 'Tylenol' and it finds the exact clinical drug, its strength, dose form, and related products. It is free with no key and is the backbone of most U.S. medication systems.

Details

No key needed. You can call it right away.

Auth: No key

Rate limit: 20 requests per second per IP address.

Verified: 2026-09-13

Best for: personal developer business

Read the docs Back to catalog

Setup

  1. Paste the example URL into your browser to see it resolve a drug name instantly, no signup needed.
  2. Replace Tylenol with any drug name, brand, or ingredient in your requests.
  3. Read the docs page to pick endpoints for dose forms, related drugs, and history.
  4. Keep calls under 20 per second per IP address.
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