the safety and efficacy of claversal ( coated , oral 5-aminosalicylic acid ( 5-asa ) 0.75 g/day ) and sulphasalazine 1.5-2.0 g/day were compared for the maintenance treatment of ulcerative colitis in a 1-year double-blind trial .
C0036078
sulphasalazine
C0009324
ulcerative colitis