Istalol 0.5 % 24HR Ophthalmic Solution
RxNorm 1992300

Concept Hierarchy & Relationship Mapping

RxNorm Concept Unique Identifier (RxCUI) 1992300 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: Istalol 0.5 % 24HR Ophthalmic Solution.

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

SBD
24 HR timolol 5 mg/ML Ophthalmic Solution [Istalol]
AUI:12366925
View
SY
Istalol 0.5 % 24 HR Ophthalmic Solution
AUI:9709766
View
PSN
Istalol 0.5 % 24HR Ophthalmic Solution
AUI:9709764
View
SY
Istalol 5 mg/ML (as timolol maleate 6.8 mg/ML) 24 HR Ophthalmic Solution
AUI:9709765
View

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

SBDPrescribable

Semantic Branded Drug (SBD):
24 HR timolol 5 mg/ML Ophthalmic Solution [Istalol]
(Atom ID: 12366925)

Clinical Status & Identity

Prescribable Status
YES (Active)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
24 HR timolol 5 MG/ML Ophthalmic Solution [Istalol]
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
N
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
1992300
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12366925
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SBD
Semantic Branded Drug (Ingredient + Strength + Dose Form + Brand Name)
Source Code
1992300
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
{328742} 10600
RXCUI of BOSS Active Ingredient preceded by RXCUI of SCDC responsible for value
RXN AM
{328742} 10600
RXCUI of BOSS Active Moiety preceded by RXCUI of SCDC responsible for value
RXN AVAILABLE STRENGTH
5 MG/ML
Available drug strengths listed in the order of ingredients from the drug
RXN BOSS FROM
{328742} 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 HUMAN DRUG
US
Drug available for use in Humans
RXN QUANTITY
24 HR
Normal Form quantity factor
RXTERM FORM
Sol
The RxTerm dose form name for this drug
SYPrescribable

Synonym (SY):
Istalol 0.5 % 24 HR Ophthalmic Solution
(Atom ID: 9709766)

Clinical Status & Identity

Prescribable Status
YES (Active)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
Istalol 0.5 % 24 HR Ophthalmic Solution
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
N
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
1992300
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
9709766
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
1992300
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.
PSNPrescribable

Prescribable Name (PSN):
Istalol 0.5 % 24HR Ophthalmic Solution
(Atom ID: 9709764)

Clinical Status & Identity

Prescribable Status
YES (Active)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
Istalol 0.5 % 24HR Ophthalmic Solution
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
N
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
1992300
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
9709764
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
1992300
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.
SYPrescribable

Synonym (SY):
Istalol 5 mg/ML (as timolol maleate 6.8 mg/ML) 24 HR Ophthalmic Solution
(Atom ID: 9709765)

Clinical Status & Identity

Prescribable Status
YES (Active)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
Istalol 5 MG/ML (as timolol maleate 6.8 MG/ML) 24 HR Ophthalmic Solution
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
N
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
1992300
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
9709765
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SY
Synonym (Synonym of another TTY, given for clarity.)
Source Code
1992300
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.

Patient Education

Timolol Ophthalmic


Ophthalmic timolol is used to treat glaucoma, a condition in which increased pressure in the eye can lead to gradual loss of vision. Timolol is in a class of medications called beta-blockers. It works by decreasing the pressure in the eye.
[Learn More]


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