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Treatment of Ulcerative Colitis With Clonidine

In the present 30‐week, double‐blind study of 45 ulcerative colitis (UC) patients treated with prednisone, sulfasalazine, clonidine, or placebo, we found that clonidine (an alpha2 agonist) and prednisone were effective in treating idiopathic UC. Both drugs were more effective than sulfasalazine. Furthermore, clonidine potentiated prednisone and sulfasalazine effects. Clonidine was chosen because its effect on distal colon motility is similar to thioproperazine, an antipsychotic drug that despite many adverse effects, possesses powerful anti‐UC properties. Rating scales were outlined in order to evaluate clinical, endoscopic, histologic, and radiologic changes. Plasma cortisol levels, sedimentation rate, serum glutamic‐oxaloacetic transaminase, serum glutamic‐pyruvic transaminase, and other biochemical parameters were determined to assess the efficacy of each drug. Distal colon motility changes were also assessed. All our UC patients showed raised cortisol plasma levels and low sigmoidal tone during relapse periods. These parameters were reversed during remission periods. Peripheral and central mechanisms are discussed.