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Banned pharmaceutical (sulfonamide)

Sulfamethazine

CAS 57-68-1
8

Safety score · 0–100

Avoid

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

Sulfamethazine is a veterinary sulfonamide antibiotic, not a cosmetic ingredient. It is banned from cosmetics in the EU due to allergy risk and pharmacological activity unsuitable for topical consumer use.

Skin benefits

  • No legitimate cosmetic benefit
  • Veterinary antibacterial sulfonamide drug only

Known concerns

  • Prescription antibiotic, not a cosmetic ingredient
  • Known skin sensitizer in the sulfonamide class
  • Suspected endocrine and thyroid effects in animal studies
  • Banned from cosmetic use under EU Annex II

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.