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In some countries, this medicine may only be approved for veterinary use.

CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Category


Chemical Names

O,O-dimetyl-O,p-(dimetylsulfamoyl)phenyl phosphorotioate

p-hydroxy-N,N-dimetylbenzenesulfonamide ester wit phosphorotioic aicd O,O-dimetyl ester

Phosphorotioic acid O-[4-[(dimetylamino)sulfonyl]phenyl] O,O-dimetyl ester

Foreign Names

  • Famphur (German)
  • Famfur (Spanish)

Generic Names

  • AC 38023 (IS)
  • AI3-25644 (IS)
  • American cyanamid CL-38023 (IS)
  • BRN 2224254 (IS)
  • Caswell No. 456D (IS)
  • CL-38023 (IS)
  • EINECS 200-154-0 (IS)
  • ENT 25644 (IS)
  • EPA Pesticide Chemical Code 059901 (IS)
  • Famphos (IS)
  • HSDB 6048 (IS)
  • RCRA waste number P097 (IS)
  • Warbex (IS)

Brand Names

  • Famix [veterinary use]
    Intervet, United States
  • Purina [veterinary use]
    Virbac AH, United States
  • Tramisol-X-Tra [+ Levamisole] [veterinary use]
    Intervet, United States
  • Warbex Famphur Cattle [veterinary use]
    Intervet, United States


ISInofficial Synonym

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.