FIELD : medicine.SUBSTANCE : invention refers to medicine, namely to surgery, and can be used, in particular, for prevention of gastrointestinal injuries in patients with surgical renal diseases in early postoperative period. Method for preventing gastric bleeding in the kidneys for oncological diseases involves administering to a patient three days before omeprazole 20 mg twice a day, 30 minutes before meals, clarithromycin 500 mg twice day 20 minutes before meals, amoxicillin 1000 milligrams 2 times day 10 minutes after eating, bactistatin 2 capsules 2 times a day during meals, then from the first to the seventh postoperative day omeprazole 40 mg once a day intravenously drop-by-drop, clarithromycin 500 milligrams 2 times a day intravenously drop-by-drop, amoxicillin 1000 milligrams 2 times a day, dissolving tablet in 20 millilitres of water, bactistatin 2 capsules 2 times a day.EFFECT : disclosed method enables reducing the incidence of acute gastroduodenal ulcers and erosions in the early postoperative period in patients operated on the kidney compared to the prototype.1 cl, 3 ex