Monday, July 19, 2010

Substance Registration System

A new web site sponsored by the US Food and Drug Administration (FDA) is now available.

This database provides access to the FDA Unique Ingredient Identifier (UNII) assigned to substances by the FDA Substance Registration System

The UNII is an essential element required for the listing of substances in the FDA Structured Product Labeling (SPL). The Division of Specialized Information Services (SIS) of the National Library of Medicine (NLM) and the FDA collaborated to make access to this code easier.

Users entering a substance name or a UNII will be directed to the FDA record. Spell checking and autosuggest are available for each query. If no UNII is available for a substance, the user is referred to the FDA to request one.

Links to the NLM ChemIDplus ( and the Drug Information Portal ( are provided for most drugs. The database is updated weekly with data provided by FDA.

Follow the activity of the National Library of Medicine's Specialized Information Services (SIS) Division .

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