One hundred and eight patients with an endoscopically documented healed duodenal ulcer (DU) participated to a multicentre, randomized, double-blind, long-term study. The study was planned with the aim to compare the efficacy of nizatidine 150 mg with ranitidine 150 mg in preventing relapse during the 2 years following the DU healing. Fifty four patients were assigned to each treatment. Endoscopic examinations were scheduled at 6, 12 and 24 months. Clinical evaluations were performed every two months. Routine laboratory tests were investigated at the beginning of the study and at each of the scheduled endoscopies.
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