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Now Available: Search DailyMed by Unique Ingredient Identifier (UNII)

Posted by on October 20th, 2017 Posted in: NLM Resources, Search Tools


Users can now search DailyMed by unique ingredient identifier (UNII) for an active ingredient and an active moiety. Instead of relying on drug or chemical names, which vary across countries and regions, searching by UNII allows DailyMed to retrieve drug product records by ingredient using a common global identifier. To illustrate, a common active ingredient in anti-allergy medications is diphenhydramine hydrochloride with UNII TC2D6JAD40. Searching “TC2D6JAD40” in DailyMed retrieves over 1500 drug product records. Diphenhydramine with UNII 8GTS82S83M is the active moiety of diphenhydramine hydrochloride. Searching “8GTS82S83M” retrieves over 1600 records as of October 2017.

A UNII is a globally used, non-proprietary, free, unique, unambiguous, non-semantic, alphanumeric identifier based on a substance’s molecular structure and/or descriptive information. The joint Food and Drug Administration (FDA) / United States Pharmacopeia (USP) Substance Registration System (SRS) assigns a UNII to a substance when enough information is collected.

Image of the author ABOUT Alan Carr
Alan Carr is the Associate Director, National Network of Libraries of Medicine, Pacific Southwest Region, based at UCLA.

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This project is funded by the National Library of Medicine, National Institutes of Health, Department of Health and Human Services, under Cooperative Agreement Number UG4LM012341 with the UCLA Louise M. Darling Biomedical Library.

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