Flufenamic acid
Clinical data
AHFS/Drugs.comInternational Drug Names
Routes of
By mouth, topical
ATC code
Legal status
Legal status
  • AU: S4 (Prescription only)
Pharmacokinetic data
Protein bindingextensively
MetabolismHydroxylation, glucuronidation
Elimination half-life~3 h
Excretion50% urine, 36% feces
  • 2-{[3-(Trifluoromethyl)phenyl]amino}benzoic acid
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.007.723 Edit this at Wikidata
Chemical and physical data
Molar mass281.234 g·mol−1
3D model (JSmol)
Melting point124 to 125 °C (255 to 257 °F) resolidification and remelting at 134°C to 136°C
Solubility in waterPractically insoluble in water; soluble in ethanol, chloroform and diethyl ether mg/mL (20 °C)
  • FC(F)(F)c1cc(ccc1)Nc2ccccc2C(=O)O
  • InChI=1S/C14H10F3NO2/c15-14(16,17)9-4-3-5-10(8-9)18-12-7-2-1-6-11(12)13(19)20/h1-8,18H,(H,19,20) checkY

Flufenamic acid (FFA) is a member of the anthranilic acid derivatives (or fenamate) class of nonsteroidal anti-inflammatory drugs (NSAIDs).[1]: 718  Like other members of the class, it is a cyclooxygenase (COX) inhibitor, preventing the formation of prostaglandins.[2] FFA is known to bind to and reduce the activity of prostaglandin F synthase and activate TRPC6.[3]

It is not widely used in humans as it has a high rate (30–60%) of gastrointestinal side effects.[4]: 310  It is generally not available in the US.[2] It is available in some Asian and European countries as a generic drug.[5]

Scientists led by Claude Winder from Parke-Davis invented FFA in 1963, along with fellow members of the class, mefenamic acid in 1961 and meclofenamic acid in 1964.[1]: 718 

Although flufenamic acid was at one time informally referred to as "Fluffy" (see history cache), this pet name could also refer to flufenoxine.


  1. ^ a b Whitehouse MW (2005). "Drugs to treat inflammation: a historical introduction". Current Medicinal Chemistry. 12 (25): 2931–42. doi:10.2174/092986705774462879. ISBN 9781608052073. PMID 16378496.
  2. ^ a b NIH LiverTox Database Mefenamic Acid Last updated June 23, 2015. Page accessed July 3, 2015. Quote: "(fenamates generally not available in the United States, such as tolfenamic acid and flufenamic acid)"
  3. ^ "Chemical–Gene Interaction Query: Flufenamic Acid (Homo sapiens)". Comparative Toxicogenomics Database. North Carolina State University. Retrieved 4 July 2015.
  4. ^ Aronson JK (2009). Meyler's Side Effects of Analgesics and Anti-inflammatory Drugs. Elsevier. ISBN 978-0-08-093294-1.
  5. ^ "International listings for flufenamic acid". Drugs.com. Retrieved 3 July 2015.