@spiker Welcome to Mayo Clinic Connect! This is Mayo Clinic’s information on Leflunomide:
https://www.mayoclinic.org/drugs-supplements/leflunomide-oral-route/precautions/drg-20067158?
There are quite a few discussions about RA, but none specially about Leflunomide, but you could certainly ask your question in other groups and someone may come forward.
How are you doing on Leflunomide? Are side effects a problem?