Three groups of patients were studied with the purpose of assessing the efficiency of the application of Pariet in the complex treatment of chronic pancreatitis. The first group (16 people) underwent conventional treatment (spasmolytics, enzymes, disintoxication therapy). In addition to conventional treatment, the second (22 people) and third (21 people) groups were administered Pariet (rabeprazole), 20 mg per day, or Quamatel (famotidine), 40 mg per day, respectively. The intragastric and intraduodenal pH was higher against the background of the treatment with Pariet than against the background of the application of Quamatel even within the first hours and days of treatment. A faster pain relief was observed in the second group of patients (p 0.05) than in the third one. According to the MRI data, the seven-day Pariet treatment of patients with chronic pancreatitis was accompanied by a reduction of the pancreas size, the diameter of the main pancreatic duct and the pancreatic edema. Thus, the application of Pariet in the complex treatment of chronic pancreatitis promotes a faster and more efficient pain relief and reduction of pancreatic edemas, as compared to the Quamatel therapy.