citric acid, anhydrous
RxCUI 221946
Understanding this RxNorm record
RxNorm identifiers distinguish ingredients, specific strengths, dose forms, and branded products. They help connect equivalent terminology across data sources; an RxNorm entry does not by itself establish that a product is currently marketed, approved for a particular use, or appropriate for an individual.
Clinical-trial associations reflect registry-reported intervention names and verified mappings where available. A medication listed in a trial may be investigational for that condition. Consult the original study record and official prescribing information for indications and safety details.
Terminology source: National Library of Medicine RxNorm. Trial source: ClinicalTrials.gov.
RxNorm ingredient and formulation relationships
Source-verified product relationships. Every strength, delivery form and RxCUI remains a separate clinical concept.
Citric acid
Citric acid is an organic compound with the formula C6H8O7. It is a colorless weak organic acid. It occurs naturally in citrus fruits. In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms. More than two million tons of citric acid are manufactured every year. It is used widely as acidifier, flavoring, preservative, and chelating agent. A citrate is a derivative of citric acid; that is, the salts, esters, and the polyatomic anion found in solutions and salts of citric acid. An example of the former, a salt is trisodium citrate; an ester is triethyl citrate. When citrate trianion is part of a salt, the formula of the citrate trianion is written as C6H5O73– or C3H5O(COO)33–.
Background only. Canonical identity remains RxNorm; clinical-trial relationships come from ClinicalTrials.gov.Conditions being studied
Drug identity and terminology: RxNorm. Trial relationships: ClinicalTrials.gov.