Objectives:Each surgical patient is preoperatively, intraoperatively and postoperatively exposed to stress. The aim of this study was to determine the existence of preoperative anxiety, and to determine its impact on hemodynamic parameters (blood pressure, heart rate) in patients and dose of anesthetics during induction of anesthesia.Methods:A prospective clinical study conducted at the Department of Anesthesiology and Reanimation and Surgery Clinic of University Clinical Center Tuzla (UCC) in the period May 2012. to January 2015. The 80 patients were analyzed which were planned for and done an elective cholecystectomy surgery or herniectomy surgical intervention. Preoperative anxiety was measured with the help of Spielberg test and evaluation of depth of anesthesia was performed with BIS monitoring.Results:The results showed that all patients had some degree of preoperative manifest anxiety. Average values of mean arterial pressure, preoperatively and after the induction of general anesthesia, differed for 15,4 mm/Hg, but were not observed significant association between Spielberg score and differences in blood pressure. Preoperative anxiety is a significant predictor of administered dose of anesthetic. Each additional score on Spielberg scale reduces the dose of anesthetic for 0,304 mg/kgTT.Conclusion:Adequate assessment of preoperative anxiety and undertaking of certain steps to reduce it can assist in accurately determining the required dosage of anesthetic for the introduction of general anesthesia.