Processes for making- and a new crystalline form of- leflunomide

Abstract

New leflunomide Form III is disclosed, along with processes for preparing it. The present invention also provides an economic process for preparing leflunomide Form II and a process for preparing leflunomide Form I from leflunomide Form III. Pharmaceutical compositions and dosage forms containing the new form and methods of using them for the treatment of rheumatoid arthritis are also disclosed.

Dependencies are inferred from the claim text.