Despite modern drugs and technologies in medicine, the questions of adequate analgesia in the postoperative period remain quite relevant. The effectiveness of preventive analgesia in the perioperative period remains a contentious issue. The study included 53 oncosurgical patients. Gr.1 received dexketoprofen in combination with paracetamol for perioperative analgesia before the operation, Gr.2 the same medication was given before closing the operating wound. Anesthesia in both groups included an inhaled (Sevoran) and an extended epidural. The study showed that the pain intensity on ANI monitoring and the total dose of fentanyl was less in Gr.1, compared to Gr.2. Cortisol plasma level and the level of glycemia in the perioperative period were less in patients in Gr.1 than in Gr.2. Pain intensity after surgery during first postoperative day was lower in Gr.1, then in Gr.2. The administration of multimodal analgesia with paracetamol and dexketoprofen prior to the surgical interventions provides for the best quality of perioperative analgesia in oncological surgical interventions.