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Teriflunomide structure.svg
Ball-and-stick model of the teriflunomide molecule
Systematic (IUPAC) name
Clinical data
Trade names Aubagio
Licence data US FDA:link
  • US: X (Contraindicated)
Legal status
Routes of
Pharmacokinetic data
Protein binding >99.3%
Biological half-life 2 weeks
Excretion Biliary/fecal, renal
CAS Registry Number 163451-81-8 N
ATC code L04AA31
PubChem CID: 5479847
ChemSpider 16737143 YesY
KEGG D10172 N
Chemical data
Formula C12H9F3N2O2
Molecular mass 270.207 g/mol
 N (what is this?)  (verify)

Teriflunomide (trade name Aubagio, marketed by Sanofi, also known as A77 1726) is the active metabolite of leflunomide.[1] Teriflunomide was investigated in the Phase III clinical trial TEMSO as a medication for multiple sclerosis (MS). The study was completed in July 2010.[2] 2-year results were positive.[3] However, the subsequent TENERE head-to-head comparison trial reported that "although permanent discontinuations [of therapy] were substantially less common among MS patients who received teriflunomide compared with interferon beta-1a, relapses were more common with teriflunomide."[4] The drug was approved by the FDA on September 13, 2012[5] and in the European Union on August 26, 2013.[6]

Mechanisms of action[edit]

Teriflunomide is an immunomodulatory drug inhibiting pyrimidine de novo synthesis by blocking the enzyme dihydroorotate dehydrogenase. It is uncertain whether this explains its effect on MS lesions.[7]

Teriflunomide inhibits rapidly dividing cells, including activated T cells, which are thought to drive the disease process in MS. Teriflunomide may decrease the risk of infections compared to chemotherapy-like drugs because of its more-limited effects on the immune system.[8]

It has been found that teriflunomide blocks the transcription factor NF-κB. It also inhibits tyrosine kinase enzymes, but only in high doses not clinically used.[9]

Activation of leflunomide to teriflunomide[edit]

Teriflunomide is the main active in vivo metabolite of leflunomide. Upon administration of leflunomide, 70% of the drug administered converts into teriflunomide. The only difference between the molecules is the opening of the isoxazole ring. This is considered a simple structural modification and a technically simple one-step synthetic transformation. Upon oral administration of leflunomide in vivo, the isoxazole ring of leflunomide is opened and teriflunomide is formed.[10]

A77 1726, more commonly known as teriflunomide (brand name Aubagio®) is the one and only active metabolite of leflunomide, completely responsive to all its therapeutic actions. It results from the reaction of isoxazole ring opening, which occurs in vivo. Teriflunomide then can interconvert between the E and Z enolic forms (and the corresponding keto-amide), with the Z-enol being the most stable and therefore most predominant form.[11][12]
Space-filling model of the E-isomer of teriflunomide.

“Regardless of the substance administered (leflunomide or teriflunomide), it is the same molecule (teriflunomide)—the one exerting the pharmacological, immunological or metabolic action in view of restoring, correcting or modifying physiological functions, and does not present, in clinical use, a new chemical entity to patients.”[10] Because of this, EMA had not considered teriflunomide being a new active substance.[13]

See also[edit]

See Leflunomide for information on pharmacokinetics, side-effects, contraindications and other data.


  1. ^ Magne D, Mézin F, Palmer G, Guerne PA (2006). "The active metabolite of leflunomide, A77 1726, increases proliferation of human synovial fibroblasts in presence of IL-1beta and TNF-alpha". Inflamm. Res. 55 (11): 469–75. doi:10.1007/s00011-006-5196-x. PMID 17122964. 
  2. ^ ClinicalTrials.gov Phase III Study of Teriflunomide in Reducing the Frequency of Relapses and Accumulation of Disability in Patients With Multiple Sclerosis (TEMSO)
  3. ^ "Sanofi-Aventis’ Teriflunomide Comes Up Trumps in Two-Year Phase III MS Trial". 15 Oct 2010. 
  4. ^ Gever, John (June 4, 2012). "Teriflunomide Modest Help but Safe for MS". medpage. Joint meeting of the Consortium of Multiple Sclerosis Centers and the Americas Committee for Treatment and Research in Multiple Sclerosis. report author= Vermersch, Pstrick. Retrieved June 4, 2012. 
  5. ^ "FDA approves new multiple sclerosis treatment Aubagio" (Press release). US FDA. Retrieved 2012-09-14. 
  6. ^ EU authorisation details, EMA, retrieved 2014-04-29 
  7. ^ H. Spreitzer (March 13, 2006). "Neue Wirkstoffe - Teriflunomid". Österreichische Apothekerzeitung (in German) (6/2006). 
  8. ^ Dr. Timothy Vollmer (May 28, 2009). "MS Therapies in the Pipeline: Teriflunomide". EMS News (May 28, 2009). 
  9. ^ Breedveld, FC; Dayer, J-M (November 2000). "Leflunomide: mode of action in the treatment of rheumatoid arthritis". Ann Rheum Dis 59 (11): 841–849. doi:10.1136/ard.59.11.841. PMC 1753034. PMID 11053058. 
  10. ^ a b Melchiorri, Daniela; Barbara, van Zwieten-Boot; Romaldas, Maciulaitis; Nela, Vilceanu; Karsten, Bruins Slot; Ian, Hudson; Robert, Hemmings; Harald, Enzmann; Pierre, Demolis. "Assessment report. AUBAGIO (international non-proprietary name: teriflunomide). Procedure No. EMEA/H/C/002514/0000" (PDF). European Medicines Agency. European Medicines Agency. p. 119. Retrieved 5 June 2015. 
  11. ^ Rozman, B (2002). "Clinical Pharmacokinetics of Leflunomide.". Clinical pharmacokinetics 41 (6): 421–30. PMID 12074690. 
  12. ^ Tandon, Ph.D., Veneeta. "Clinical Pharmacology/Biopharmaceutics Review of ARAVA™ (leflunomide tablets)" (PDF). http://www.accessdata.fda.gov. Center for Drug Evaluation and Research. Application Number: NDA 20-905 (ORIG). Retrieved 5 June 2015. 
  13. ^ European Medicines Agency. Committee for Medicinal Products for Human Use. (27 June 2013). "Summary of Opinion (Initial Authorisation of Aubagio /teriflunomide/)" (PDF). European Medicines Agency (http://www.ema.europa.eu/ema/). Retrieved 5 June 2015. 

External links[edit]