24 HR chlorpheniramine maleate 16 mg Extended Release Oral Tablet [Efidac-24 Chlorpheniramine]
RxNorm 2199669

Concept Hierarchy & Relationship Mapping

RxNorm Concept Unique Identifier (RxCUI) 2199669 represents a standardized clinical drug concept used for cross-system interoperability. This concept aggregates multiple Atom IDs (AUIs), which are specific naming variations and synonyms used across pharmaceutical databases to ensure accurate medication mapping for: 24 HR chlorpheniramine maleate 16 mg Extended Release Oral Tablet [Efidac-24 Chlorpheniramine].

The following semantic concepts and normalized strings are associated with this clinical entity:

SBD
24 HR chlorpheniramine maleate 16 mg Extended Release Oral Tablet [Efidac-24 Chlorpheniramine]
AUI:12360305
View
SY
24 HR Efidac-24 chlorpheniramine maleate 16 mg Extended Release Oral Tablet
AUI:11447925
View
SY
Efidac-24 Chlorpheniramine maleate 16 mg 24 HR Extended Release Oral Tablet
AUI:11447926
View

This clinical crossover tool is designed for healthcare professionals, pharmacists, and data analysts to safely compare substitute products and manage medication interoperability.

SBD

Semantic Branded Drug (SBD):
24 HR chlorpheniramine maleate 16 mg Extended Release Oral Tablet [Efidac-24 Chlorpheniramine]
(Atom ID: 12360305)

Clinical Status & Identity

Prescribable Status
NO (Reference)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
24 HR chlorpheniramine maleate 16 MG Extended Release Oral Tablet [Efidac-24 Chlorpheniramine]
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
O
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
2199669
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12360305
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SBD
Semantic Branded Drug (Ingredient + Strength + Dose Form + Brand Name)
Source Code
2199669
The "Most useful" identifier asserted by the original source vocabulary.

Source & Registry Data

Source Name
RxNorm Vocabulary (RXNORM)
The official name and abbreviation for the vocabulary source.
Source Version
20AA_260601F
The specific version of the vocabulary provided by the source.
Update Date
June 01, 2026
The date when this RxNorm data was last updated by the NLM.
License Contact
RxNorm Customer Service, , U.S. National Library of Medicine, 8600 Rockville Pike, , Bethesda, MD, United States, 20894, (888) FIND-NLM, , https://support.nlm.nih.gov/support/create-case/, https://www.nlm.nih.gov/research/umls/rxnorm/
Source licensing contact information.

Technical Attributes & Logic

RXN OBSOLETED
04/30/2020
Date the RxNorm atom became obsolete
RXN QUANTITY
24 HR
Normal Form quantity factor
SY

Synonym (SY):
24 HR Efidac-24 chlorpheniramine maleate 16 mg Extended Release Oral Tablet
(Atom ID: 11447925)

Clinical Status & Identity

Prescribable Status
NO (Reference)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
24 HR Efidac-24 chlorpheniramine maleate 16 MG Extended Release Oral Tablet
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
O
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
2199669
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
11447925
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
2199669
The "Most useful" identifier asserted by the original source vocabulary.

Source & Registry Data

Source Name
RxNorm Vocabulary (RXNORM)
The official name and abbreviation for the vocabulary source.
Source Version
20AA_260601F
The specific version of the vocabulary provided by the source.
Update Date
June 01, 2026
The date when this RxNorm data was last updated by the NLM.
License Contact
RxNorm Customer Service, , U.S. National Library of Medicine, 8600 Rockville Pike, , Bethesda, MD, United States, 20894, (888) FIND-NLM, , https://support.nlm.nih.gov/support/create-case/, https://www.nlm.nih.gov/research/umls/rxnorm/
Source licensing contact information.
SY

Synonym (SY):
Efidac-24 Chlorpheniramine maleate 16 mg 24 HR Extended Release Oral Tablet
(Atom ID: 11447926)

Clinical Status & Identity

Prescribable Status
NO (Reference)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
Efidac-24 Chlorpheniramine maleate 16 MG 24 HR Extended Release Oral Tablet
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
O
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
2199669
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
11447926
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
2199669
The "Most useful" identifier asserted by the original source vocabulary.

Source & Registry Data

Source Name
RxNorm Vocabulary (RXNORM)
The official name and abbreviation for the vocabulary source.
Source Version
20AA_260601F
The specific version of the vocabulary provided by the source.
Update Date
June 01, 2026
The date when this RxNorm data was last updated by the NLM.
License Contact
RxNorm Customer Service, , U.S. National Library of Medicine, 8600 Rockville Pike, , Bethesda, MD, United States, 20894, (888) FIND-NLM, , https://support.nlm.nih.gov/support/create-case/, https://www.nlm.nih.gov/research/umls/rxnorm/
Source licensing contact information.