The aim of the study was to assess the effect of lidocaine infusion on postoperative morphine demand, the recovery profile, quality of life and the incidence of chronic pain in children undergoing extensive spinal surgery. The safety of the drug was determined. Lidocaine has been shown to reduce the requirement for sevoflurane and morphine, accelerate the return of normal consciousness after surgery, restoring normal gastrointestinal and allows earlier rehabilitation. The relationship between drug supply and time of hospitalization and patients' quality of life has not been proven. Chronic pain has been shown to be a problem for over 1/3 of patients 1 and 4 years after surgery. The safety of the drug has been demonstrated and the dosage at which lidocaine reaches therapeutic blood levels has been determined. Lidocaine has been shown to be an effective co-analgesic as an element of multimodal analgesic therapy. The study extends knowledge about the proper treatment of acute pain in children.