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In the US, Leflunomide (leflunomide systemic) is a member of the following drug classes: antirheumatics, selective immunosuppressants and is used to treat Psoriatic Arthritis and Rheumatoid Arthritis.

US matches:

UK matches:



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Selective immunosuppressant

Anti-inflammatory agent

Disease-modifying antirheumatic drug, DMARD

Chemical Name

4-Isoxazolecarboxamide, 5-metyl-N-(4-trifluorometyl)phenyl)-

Foreign Names

Generic Names

  • Leflunomide (OS: USAN, BAN, JAN)
  • Léflunomide (OS: DCF)
  • HWA 486 (IS: HoechstMarion)
  • RS 34821 (IS: HoechstMarion)
  • SU 101 (IS: Sugen)
  • Leflunomide (PH: BP 2016, Ph. Eur. 8, USP 38)
  • Leflunomidum (PH: Ph. Eur. 8)

Brand Names


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

Click for further information on drug naming conventions and 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.