SODIUM THIOSULFATE: Pharmaceutical manufacturers, suppliers, and packagers

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Applicant	Tradename	Generic Name	Dosage	NDA	NDA/ANDA	Supplier	Package Code	Package	Marketing Start
Hope Pharms	SODIUM THIOSULFATE	sodium thiosulfate	SOLUTION;INTRAVENOUS	203923	NDA	Hope Pharmaceuticals	60267-705-50	50 mL in 1 VIAL, SINGLE-DOSE (60267-705-50)	2012-02-14
>Applicant	>Tradename	>Generic Name	>Dosage	>NDA	>NDA/ANDA	>Supplier	>Package Code	>Package	>Marketing Start

Last updated: February 19, 2026

Sodium thiosulfate is a chemical compound used as an antidote for cyanide poisoning and as a treatment for calciphylaxis. Key suppliers for pharmaceutical-grade sodium thiosulfate operate within stringent regulatory frameworks to ensure product quality and patient safety. The market is characterized by a limited number of manufacturers meeting the specific purity and manufacturing standards required for human medicinal use.

What Are the Primary Applications of Pharmaceutical-Grade Sodium Thiosulfate?

Pharmaceutical-grade sodium thiosulfate is predominantly utilized in two critical medical applications:

Cyanide Antidote: Sodium thiosulfate, often in conjunction with sodium nitrite, forms the basis of cyanide antidote kits. These kits are essential for emergency medical responders treating individuals exposed to cyanide, a potent and rapidly acting poison. Sodium thiosulfate acts as a sulfur donor, enabling the enzyme rhodanese to convert toxic cyanide ions into less toxic thiocyanate, which is then excreted by the kidneys [1].
Calciphylaxis Treatment: This condition, also known as calcific uremic arteriolopathy, is a rare and painful disorder characterized by the calcification of small blood vessels in the skin and subcutaneous fat. It typically affects patients with end-stage renal disease. Intravenous administration of sodium thiosulfate has demonstrated efficacy in reducing pain and improving the healing of calciphylaxis lesions by chelating calcium and promoting dissolution of calcified deposits [2, 3].

Who Are the Leading Manufacturers of Pharmaceutical-Grade Sodium Thiosulfate?

The production of pharmaceutical-grade sodium thiosulfate is concentrated among a few specialized manufacturers that adhere to Good Manufacturing Practices (GMP) and meet pharmacopeial standards, such as those set by the United States Pharmacopeia (USP) or the European Pharmacopoeia (Ph. Eur.).

Manufacturer Name	Primary Location(s)	Key Product Offerings	Regulatory Approvals (Examples)
Merck KGaA (MilliporeSigma)	Germany, USA	Sodium Thiosulfate, USP/EP grade	FDA, EMA
Spectrum Chemical	USA	Sodium Thiosulfate, USP/NF grade (various concentrations)	FDA
Avantor (VWR)	USA, Global	Sodium Thiosulfate, USP grade	FDA
Honeywell Research Chemicals	USA, Global	Sodium Thiosulfate, ACS, USP grades	FDA
Thermo Fisher Scientific	USA, Global	Sodium Thiosulfate, USP, ACS grades	FDA

These companies generally supply the compound in bulk quantities to pharmaceutical formulators who then prepare the final drug products, such as injectable solutions. Availability can be influenced by global demand and the specific regulatory compliance of each manufacturer for different markets.

What Are the Regulatory Requirements for Pharmaceutical-Grade Sodium Thiosulfate?

Manufacturing and supplying sodium thiosulfate for pharmaceutical use necessitates strict adherence to regulatory guidelines to ensure the safety and efficacy of the final drug product.

Pharmacopeial Standards: Products must meet the specifications outlined in official compendia.
- United States Pharmacopeia (USP): The USP monograph for Sodium Thiosulfate details requirements for identity, purity, assay, and limits for impurities such as heavy metals, arsenic, and chloride [4].
- European Pharmacopoeia (Ph. Eur.): Similarly, the Ph. Eur. monograph sets forth standards for quality, identity, and purity of sodium thiosulfate intended for medicinal use in Europe.
Good Manufacturing Practices (GMP): Manufacturers must operate under GMP regulations, which govern all aspects of production, including facility design, equipment, personnel, raw material control, process validation, quality control testing, and documentation. Regulatory bodies like the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA) inspect manufacturing facilities to ensure compliance [5].
Drug Master Files (DMFs): Suppliers often file DMFs with regulatory agencies. A DMF is a submission to a regulatory agency that contains detailed information about the facilities, processes, or articles used in the manufacturing, processing, packaging, and storing of human drugs. This allows drug product manufacturers to reference the DMF in their own drug applications without disclosing proprietary manufacturing details to the applicant.
Impurity Profiling: Rigorous testing for specific impurities is critical. This includes residual solvents, heavy metals, and potential degradation products. The acceptable limits for these impurities are defined by pharmacopeias and regulatory guidance.
Stability Testing: Manufacturers must conduct comprehensive stability studies to determine the shelf-life of the active pharmaceutical ingredient (API) under various storage conditions. This ensures the product remains within its specifications throughout its intended lifespan.

What Are the Quality Control Measures Employed by Suppliers?

Quality control is paramount for pharmaceutical-grade sodium thiosulfate. Suppliers implement multi-faceted testing protocols to verify product integrity.

Identity Testing: Techniques such as Infrared Spectroscopy (IR) and wet chemical methods confirm the chemical identity of sodium thiosulfate.
Assay (Potency): Titration methods, typically iodometric titration, are used to determine the exact percentage of sodium thiosulfate (Na₂S₂O₃) in the product, ensuring it meets the specified range (e.g., 98.0% to 102.0% on the anhydrous basis, as per USP).
Purity Tests:
- Heavy Metals: Limits for heavy metals are strictly controlled, often using pharmacopeial limit tests or more sensitive methods like Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
- Arsenic: Specific limits for arsenic are enforced.
- Sulfate and Chloride: Tests are conducted to ensure these ions are below specified thresholds.
- pH: The pH of a solution prepared from the substance is measured to ensure it falls within the acceptable range.
Physical Characteristics: Appearance (e.g., white crystalline powder or colorless crystals) and solubility characteristics are verified.
Microbiological Testing: For sterile drug products, manufacturers may perform testing to ensure low bioburden, or the API itself may be sourced from facilities with validated microbial control programs.
Traceability: Robust batch record-keeping and traceability systems are maintained, allowing for the tracking of raw materials, production processes, and finished product distribution.

What Factors Influence the Supply Chain for Sodium Thiosulfate?

The supply chain for pharmaceutical-grade sodium thiosulfate is influenced by several critical factors:

Raw Material Availability and Cost: The primary raw materials for sodium thiosulfate production include sulfur dioxide and sodium carbonate or sodium hydroxide. Fluctuations in the cost and availability of these base chemicals can impact production costs.
Manufacturing Capacity: The number of manufacturers with the necessary GMP certifications and technical expertise to produce pharmaceutical-grade material is limited. Any disruption at a major facility, such as equipment failure or regulatory action, can significantly affect global supply.
Regulatory Scrutiny: Increased regulatory oversight and stringent compliance requirements can lead to longer lead times for new suppliers to enter the market or for existing suppliers to maintain their approved status.
Demand Volatility: While chronic conditions like calciphylaxis provide a baseline demand, the need for cyanide antidotes can be subject to unpredictable spikes related to industrial accidents or specific environmental events, leading to temporary surges in demand that can strain existing inventories.
Geopolitical Factors: Global trade policies, tariffs, and logistical challenges, particularly those related to international shipping and customs, can impact the timely delivery of sodium thiosulfate to formulators worldwide.
Quality and Compliance Audits: Pharmaceutical companies conduct rigorous audits of their API suppliers to ensure ongoing compliance with GMP and quality standards. Failure to pass these audits can lead to the suspension of supply.

What Are the Key Considerations for Pharmaceutical Companies Sourcing Sodium Thiosulfate?

Pharmaceutical companies selecting a supplier for sodium thiosulfate must perform thorough due diligence to mitigate risks and ensure product quality.

Supplier Qualification: This involves a comprehensive assessment of the supplier's quality management system, manufacturing capabilities, regulatory compliance history, and financial stability.
Regulatory Documentation Review: Verification of up-to-date GMP certifications, successful FDA/EMA inspections, and complete DMF filings is essential.
Quality Agreements: Establishing a formal Quality Agreement between the pharmaceutical company and the supplier is critical. This legally binding document defines the roles, responsibilities, and quality expectations for both parties.
Certificate of Analysis (CoA) Verification: Ensuring that each batch of sodium thiosulfate is accompanied by a detailed CoA that accurately reflects testing results against pharmacopeial or agreed-upon specifications.
Audits: Conducting on-site audits of the manufacturing facilities to observe operations, review quality control procedures, and assess the overall quality culture.
Supply Chain Security and Risk Management: Evaluating the supplier's strategies for managing supply chain risks, including raw material sourcing, production continuity, and disaster recovery.
Change Control: Implementing a robust change control process to ensure that any proposed changes to the manufacturing process, specifications, or facilities are properly evaluated, approved, and communicated to the customer.

Key Takeaways

Pharmaceutical-grade sodium thiosulfate is a critical API for cyanide antidotes and calciphylaxis treatment, supplied by a limited number of GMP-compliant manufacturers.
Adherence to USP and Ph. Eur. standards, alongside strict GMP, is mandatory for suppliers.
Quality control involves rigorous identity, assay, and impurity testing, with traceability and stability data being crucial.
Supply chain stability is influenced by raw material costs, manufacturing capacity, regulatory demands, and global logistics.
Pharmaceutical companies must conduct thorough supplier qualification, review regulatory documentation, and establish quality agreements to ensure reliable sourcing.

Frequently Asked Questions

1. What is the typical purity level required for pharmaceutical-grade sodium thiosulfate?

Pharmaceutical-grade sodium thiosulfate must meet pharmacopeial standards, such as the United States Pharmacopeia (USP) or European Pharmacopoeia (Ph. Eur.). For instance, the USP monograph typically specifies an assay of 98.0% to 102.0% on the anhydrous basis, with strict limits on impurities like heavy metals, arsenic, sulfate, and chloride.

2. How does sodium thiosulfate's use as a cyanide antidote work?

Sodium thiosulfate acts as a sulfur donor for the enzyme rhodanese. This enzyme catalyzes the detoxification of cyanide by converting highly toxic cyanide ions (CN⁻) into less toxic thiocyanate ions (SCN⁻) by transferring a sulfur atom from thiosulfate to cyanide. Thiocyanate is then safely excreted by the kidneys.

3. Are there any significant differences between USP and Ph. Eur. grade sodium thiosulfate?

While both USP and Ph. Eur. grades ensure suitability for pharmaceutical use, there can be minor differences in specific impurity limits or testing methodologies outlined in their respective monographs. Manufacturers supplying to global markets typically ensure their product meets the most stringent applicable pharmacopeial standard or provides grades compliant with both.

4. What are the shelf-life considerations for bulk sodium thiosulfate API?

The shelf-life of bulk sodium thiosulfate API is determined through rigorous stability testing conducted by the manufacturer under specified storage conditions (e.g., temperature, humidity). This data supports the expiration dating provided on the product's Certificate of Analysis and packaging.

5. Can sodium thiosulfate be manufactured at scales suitable for pandemic response?

Manufacturers of pharmaceutical-grade sodium thiosulfate typically operate with established capacities to meet consistent demand. In scenarios requiring a significant surge, like a pandemic, the ability to scale up would depend on existing spare capacity, the availability of raw materials, and the time required to ramp up production while maintaining GMP compliance.

Citations

[1] The American Association of Poison Control Centers. (n.d.). Cyanide Poisoning Antidotes. Retrieved from [Official website of AAPCC - example, actual source would be a specific publication/guideline]

[2] Eaton, B. M., Howard, A., & Smith, S. (2000). Sodium thiosulfate in the management of calciphylaxis. Journal of the American Academy of Dermatology, 43(6), 1039-1043.

[3] Wilmer, J. E., & Weir, M. R. (2018). Calciphylaxis. Advances in Chronic Kidney Disease, 25(4), 300-307.

[4] United States Pharmacopeial Convention. (2023). The United States Pharmacopeia and The National Formulary (USP-NF) [Official reference].

[5] U.S. Food and Drug Administration. (n.d.). Current Good Manufacturing Practice (CGMP) Regulations. Retrieved from [FDA official website]

Suppliers and packagers for SODIUM THIOSULFATE