Bismuth Subcitrate Potassium (CAS 57644-54-9): Identity, Specifications and Sourcing Guide

Bismuth subcitrate potassium (CAS 57644-54-9) is a bismuth–potassium citrate compound also referenced as bismuth tripotassium dicitrate, colloidal bismuth subcitrate and bismuth potassium citrate. PubChem lists the molecular formula as C₁₂H₁₀BiK₃O₁₄ and the molecular weight as 704.47 g/mol.

This guide separates public chemical identity, finished-drug references and the current Longchang source product record. It is written for procurement and technical review; it does not provide patient dosing, treatment instructions or medical advice.

Quick identity check

Field	Reference value	Verification basis
CAS number	57644-54-9	PubChem and FDA substance records
Formule moléculaire	C12H10BiK3O14	PubChem
Poids moléculaire	704.47 g/mol	PubChem
FDA UNII	HS813P8QPX	FDA Global Substance Registration System
Common synonyms	Bismuth tripotassium dicitrate; colloidal bismuth subcitrate; bismuth potassium citrate	PubChem and FDA substance records

Names and formulas identify a substance, but they do not establish the grade, impurity profile, test method, regulatory suitability or release status of a specific batch. Those points must be checked against the current specification and batch documents.

What do official drug references establish?

Official DailyMed labeling identifies bismuth subcitrate potassium as one component of prescription combination capsules that also contain metronidazole and tetracycline hydrochloride. That finished-product reference does not mean that an unformulated raw material, a supplier or every intended use is FDA approved.

The FDA substance record also states that the availability of a UNII does not imply regulatory review or approval. Buyers should evaluate the intended application, destination-market requirements and finished-product controls with qualified regulatory and quality teams.

Current Longchang source product record

The values below reproduce fields present in the current Longchang product source record. They are a starting point for an inquiry, not a substitute for the specification and batch-specific documents supplied with a quotation.

Objet	Value in the source record
Apparence	Poudre blanche
Bismuth content, dry basis	35.0–38.5%
pH	6.0–8.0
Sulfate	Moins de 0,04%
Perte au séchage	Moins de 5,0%
Cuivre	Moins de 0,0025%
Plomb	Moins de 0,002%
Emballage	25 kg drum

Test methods, units, sampling rules and acceptance wording must be confirmed on the current specification. Do not infer “99% purity” from the bismuth-content range; these are different measurements.

Questions to include in a sourcing request

1. Identity: state the full chemical name and CAS 57644-54-9, including any synonym used by your internal specification.
2. Target standard: provide the required grade, compendial or customer standard, test methods and acceptance criteria.
3. Quantity: provide sample quantity, trial quantity and expected commercial volume separately.
4. Documentation: list the documents and revision level required for evaluation, such as the current specification, COA, SDS or TDS.
5. Application and destination: identify the intended industrial/formulation context and destination country so regulatory and shipping questions can be reviewed.
6. Packaging and logistics: confirm packaging size, inner liner, labeling, storage conditions and delivery terms with the quotation.

Frequently asked procurement questions

Is bismuth subcitrate potassium the same as bismuth citrate or bismuth subsalicylate?

No assumption of interchangeability should be made. Confirm the exact chemical name, CAS number, substance identity, specification and intended function for the material being evaluated.

Does an FDA UNII mean that this raw material or supplier is FDA approved?

No. The FDA substance record explains that UNII availability does not imply regulatory review or approval. Approval status applies to specific regulated products and conditions, not automatically to every raw material listing or supplier.

Are COA, SDS or TDS documents automatically available?

Document availability and revision should be requested for the quoted material. The inquiry should state which documents your quality or regulatory team needs and whether a sample evaluation is required.

What information helps Longchang prepare a useful quotation?

Include the target specification or grade, quantity, destination country, application context and required document set. The procurement box near the top of this page links to the product record and quotation form.

Safety and regulatory boundary

Review the current SDS and applicable workplace, transport, environmental and destination-market requirements before handling or specifying the material. Information on this page is for industrial procurement and technical evaluation only and must not be used as clinical instructions.

Primary identity and regulatory references

• PubChem: Bismuth Subcitrate, CID 10101269
• FDA Global Substance Registration System: UNII HS813P8QPX
• DailyMed: prescription combination product labeling

Last reviewed: 3 August 2026. Public identity records were checked against the Longchang source product record. Batch release, document revision and commercial availability remain subject to quotation and quality review.