Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12HR Extended Release Oral Tablet
RxNorm 857403

Concept Hierarchy & Relationship Mapping

RxNorm Concept Unique Identifier (RxCUI) 857403 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: Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12HR Extended Release Oral Tablet.

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

SBD
12 HR clemastine fumarate 1.34 mg / phenylpropanolamine hydrochloride 75 mg Extended Release Oral Tablet [Allerhist-D]
AUI:12425543
View
SY
Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12 HR Extended Release Oral Tablet
AUI:12425549
View
PSN
Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12HR Extended Release Oral Tablet
AUI:12425550
View
SY
Allerhist-D 1/75 12 HR Extended Release Oral Tablet
AUI:6354959
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):
12 HR clemastine fumarate 1.34 mg / phenylpropanolamine hydrochloride 75 mg Extended Release Oral Tablet [Allerhist-D]
(Atom ID: 12425543)

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
12 HR clemastine fumarate 1.34 MG / phenylpropanolamine hydrochloride 75 MG Extended Release Oral Tablet [Allerhist-D]
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)
857403
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12425543
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SBD
Semantic Branded Drug (Ingredient + Strength + Dose Form + Brand Name)
Source Code
857403
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 AI
{1145614} 3266
RXCUI of BOSS Active Ingredient preceded by RXCUI of SCDC responsible for value
RXN AI
{857400} 142430
RXCUI of BOSS Active Ingredient preceded by RXCUI of SCDC responsible for value
RXN AM
{1145614} 8175
RXCUI of BOSS Active Moiety preceded by RXCUI of SCDC responsible for value
RXN AM
{857400} 2578
RXCUI of BOSS Active Moiety preceded by RXCUI of SCDC responsible for value
RXN BOSS FROM
{1145614} AM
Source of BOSS as either from the active ingredient (AI) or the active moiety (AM) preceded by RXCUI of SCDC responsible for value
RXN BOSS FROM
{857400} AI
Source of BOSS as either from the active ingredient (AI) or the active moiety (AM) preceded by RXCUI of SCDC responsible for value
RXN OBSOLETED
09/02/2020
Date the RxNorm atom became obsolete
RXN QUANTITY
12 HR
Normal Form quantity factor
SY

Synonym (SY):
Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12 HR Extended Release Oral Tablet
(Atom ID: 12425549)

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
Allerhist-D (clemastine fumarate 1.34 MG / phenylpropanolamine HCl 75 MG) 12 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)
857403
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12425549
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
857403
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.
PSN

Prescribable Name (PSN):
Allerhist-D (clemastine fumarate 1.34 mg / phenylpropanolamine HCl 75 mg) 12HR Extended Release Oral Tablet
(Atom ID: 12425550)

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
Allerhist-D (clemastine fumarate 1.34 MG / phenylpropanolamine HCl 75 MG) 12HR 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)
857403
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12425550
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
PSN
Prescribable Name (Synonym of another TTY, given for clarity and for display purposes in electronic prescribing applications. Only one PSN per concept.)
Source Code
857403
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):
Allerhist-D 1/75 12 HR Extended Release Oral Tablet
(Atom ID: 6354959)

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
Allerhist-D 1/75 12 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)
857403
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
6354959
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
857403
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.