Process for preparing leflunomide form I

   
   

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.

O formulário novo III do leflunomide é divulgado, junto com processos para prepará-lo. A invenção atual fornece também um processo econômico preparando o formulário II do leflunomide e um processo para preparar o formulário I do leflunomide do formulário III do leflunomide. As composições pharmaceutical e os formulários de dosage que contêm o formulário e os métodos novos de usá-los para o tratamento do arthritis rheumatoid são divulgados também.

 
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