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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 Categories

Analgesic, antipyretic and anti-inflammatory agent

Non-steroidal anti-inflammatory drug, NSAID

Cyclo-oxygenase 2 (COX-2) inhibitor

Chemical Names

2(5H)-Furanone, 3-(cyclopropylmetoxy)-5,5-dimetyl-4-[4-(metylsulfonyl)phenyl]- (USAN)

3-(cyclopropylmetoxy)-4-(4-metylsulfonyl)phenyl)-5,5-dimetylfuranone (USAN)

3-(Cyclopropylmetoxy)-5,5-dimetyl-4-(4-[metylsulfonyl)phenyl]furan-2(5H)-on (IUPAC)

3-(Cyclopropylmetoxy)-5,5-dimetyl-4-(4-[metylsulfonyl)phenyl]furan-2(5H)-one (WHO)

Foreign Names

  • Firocoxibum (Latin)
  • Firocoxib (German)
  • Firocoxib (French)
  • Firocoxib (Spanish)

Generic Names

  • Firocoxib (OS: USAN)
  • Equioxx (IS: Merial)
  • ML-1,785,713 (IS: Merial)

Brand Names

  • Equioxx (veterinary use)
    Faunapharma, Finland; Merial, Austria; Merial, Belgium; Merial, Germany; Merial, France; Merial, United Kingdom; Merial, Netherlands; Merial, Norway; Merial, Poland; Merial, United States; Merial Italia, Italy; Merial Norden, Sweden; Selecta, Germany
  • NexGard (veterinary use)
    Merial Italia, Italy
  • Previcox (veterinary use)
    Biokema, Switzerland; Merial, Austria; Merial, Germany; Merial, France; Merial, United Kingdom; Merial, Israel; Merial, Norway; Merial, New Zealand; Merial, Poland; Merial, United States; Merial, South Africa; Merial Australia, Australia; Merial Italia, Italy; Merial Norden, Sweden; Selecta, Germany; Faunapharma, Finland
  • Previcox chiens (veterinary use)
    Merial, Belgium


IUPACInternational Union of Pure and Applied Chemistry
ISInofficial Synonym
OSOfficial Synonym
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name
WHOWorld Health Organization

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.