THE INVENTION RELATES TO SOLID PHARMACEUTICAL COMPOSITIONS COMPRISING (Z)-2-CYANO-BUT-2-ENOIC ACID-(4’TRIFLUOROMETHYLPHENYL)-AMIDE, AS WELL AS A PROCESS FOR THE PREPARATION OF THE SAME, METHODS OF USING SUCH COMPOSITIONS TO TREAT SUBJECTS SUFFERING FROM AUTOIMMUNE DISEASES IN PARTICULAR SYSTEMIC LUPUS ERYTHEMATOSUS OR CHRONIC GRAFT-VERSUS-HOST DISEASE, MULTIPLE SCLEROSIS OR RHEUMATOID ARTHRITIS.