Zonisamide

Zonisamide Impurities

Zonisamide is a sulfonamide anticonvulsant that is typically used in the treatment of epilepsy and sometimes Parkinson’s disease. Its impurity profile consists of structurally similar analogs, residual solvents, and degradation products. These impurities can be formed under stress conditions such as hydrolysis, oxidation, and photolysis. Its typical degradation pathways may involve oxidative breakdown of the benzisoxazole ring, hydrolytic cleavage of the sulfonamide bond, and rearrangement of aromatic substituents. These impurities may affect the potency, stability, and safety of the drug. Therefore, all impurities are structurally characterized and qualified according to ICH guidelines for toxicological assessment and analytical validation.

Zonisamide EP Impurities

We provide the pharmacopeial and non-pharmacopeial Zonisamide impurity compounds that are available in compliance with European Pharmacopoeia (EP) specifications. These standards support analytical method development, impurity profiling, and long-term stability studies. There, the EP traceable materials are supplied with validated analytical data, including purity, structural confirmation, and spectral characterization.

Zonisamide Related Compounds

Structurally related compounds and synthetic analogs of Zonisamide are included for impurity identification, toxicological qualification, and regulatory submission. These related compounds can be used in forced degradation studies, genotoxicity assessments, and impurity threshold evaluations. Hence, they are essential for understanding the impurity profile and ensuring compliance with regulatory limits.

Zonisamide Impurity Reference Standards

We provide Zonisamide impurity reference standards with validated analytical data, including purity, NMR, MS, and full Certificates of Analysis. These standards are used in pharmaceutical research, method validation, and GMP-compliant quality control. Also, the EP/USP traceable products are available upon request and are routinely re-tested to ensure consistency and reliability.