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



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Cholinesterase inhibitor (parasympathomimetic agent, indirect acting)

Anthelmintic agent



Chemical Name

Phosphonic acid, (2,2,2-trichloro-1-hydroxyetyl)-, dimetyl ester

Foreign Names

  • Metrifonatum (Latin)
  • Metrifonat (German)
  • Métrifonate (French)
  • Metrifonato (Spanish)

Generic Names

  • Metrifonate (OS: BAN)
  • Trichlorfon (OS: USAN)
  • Bayer L-13/59 (IS)
  • Chlorophos (IS)
  • DETF (IS)
  • Metriphonate (IS)
  • MTF (IS)
  • Metrifonat (PH: Ph. Eur. 8)
  • Metrifonate (PH: BP 2016, Ph. Eur. 8, Ph. Int. 4, USP 38)
  • Métrifonate (PH: Ph. Eur. 8)
  • Metrifonatum (PH: Ph. Eur. 8, Ph. Int. 4)

Brand Names

  • Benzelmin Plus (Metrifonate and Oxfendazole (veterinary use))
    Zoetis, United States
  • Dyrex (Metrifonate and Atropine (veterinary use))
    Zoetis, United States
  • Dyrex (veterinary use)
    Zoetis, United States
  • Equivet-14 (Metrifonate and Tiabendazole (veterinary use))
    Farnam, United States
  • Equizole-B (Metrifonate and Tiabendazole (veterinary use))
    Farnam, United States
  • Freed No. 10 (Metrifonate and Atropine (veterinary use))
    Zoetis, United States
  • Neguvon (veterinary use)
    Bayer, Italy
  • Telmin B (Metrifonate and Mebendazole (veterinary use))
    Intervet, United States
  • Uni Dose (veterinary use)
    Intervet SA MSD, South Africa


BANBritish Approved Name
ISInofficial Synonym
OSOfficial Synonym
PHPharmacopoeia Name
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name

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.