Description

Sulfamethoxazole CAS NO 723-46-6 is a synthetic sulfonamide antibacterial agent widely used in pharmaceutical manufacturing. It is a key intermediate in the production of co-trimoxazole, a potent combination therapy for a variety of bacterial infections. This high-purity compound is essential for pharmaceutical companies, veterinary drug producers, and research institutions developing antimicrobial formulations.

Application

• Primary active pharmaceutical ingredient (API) in antibacterial formulations.
• Key component in the manufacture of co-trimoxazole (trimethoprim/sulfamethoxazole) combination drugs.
• Used in veterinary medicine for the treatment of bacterial infections in livestock and companion animals.
• Intermediate in the synthesis of more complex sulfonamide derivatives.
• Reference standard in analytical and quality control laboratories.
• Raw material for research into antimicrobial resistance and new therapeutic agents.

Basic Information

Product Name	Sulfamethoxazole
CAS No.	723-46-6
Molecular Formula	C10H11N3O3S
Molecular Weight	253.28 g/mol
Synonyms	5-Methyl-3-sulfanilamidoisoxazole; 3-(p-Aminobenzenesulfonamido)-5-methylisoxazole; Sulfamethoxazolum; Sulfisomezole; Gantanol; Sinomin; Sulfamethoxazole (USP); N1-(5-Methyl-3-isoxazolyl)sulfanilamide
EINECS	211-963-3

Quality Control

Our Sulfamethoxazole is manufactured under strict quality management systems. It meets or exceeds relevant pharmacopoeial standards, including USP and EP monographs. Every batch undergoes comprehensive analytical testing, including identification, assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to ensure full traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Identification (HPLC)	Retention time corresponds to reference standard
Assay (HPLC)	98.0% - 102.0% (on dried basis)
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%
Heavy Metals	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.