The purpose of the joint FDA/USP Substance Registration System (SRS) is to support health information technology initiatives by generating unique ingredient identifiers (UNIIs) for substances in drugs, biologics, foods, and devices. The UNII is a non- proprietary, free, unique, unambiguous, non semantic, alphanumeric identifier based on a substance’s molecular structure and/or descriptive information.

Prefix

unii

Links

Homepage

Contact

Missing Contact

Pattern for Local Unique Identifiers

Local identifiers in Unique Ingredient Identifier should match this regular expression:
^[A-Z0-9]+$

Example Local Unique Identifier

3G6A5W338E   Resolve

Pattern for CURIES

Compact URIs (CURIEs) constructed from Unique Ingredient Identifier should match this regular expression:
^unii:[A-Z0-9]+$

Example CURIE

unii:3G6A5W338E

A summary of the relations in the Bioregistry schema can be found here.

In Collection

FHIR External Terminologies

The metaregistry provides mappings between the Bioregistry and other registries. There are 5 mappings to external registries for this resource with 3 unique external prefixes.

A provider turns a local unique identifiers from a resource into a URI. Many providers are also resolvable as URLs (i.e., they can be used in a web browser).

The local unique identifier 3G6A5W338E is used to demonstrate the providers available for Unique Ingredient Identifier. A guide for curating additional providers can be found here.