This study was aimed to analyze the effect of three drugs (Propofol, Etomidate and Thiopental sodium) in hemodynamic changes during suspension laryngoscopy as hypnotic drugs. This is a double-blinded study on 75 patients undergoing elective suspension laryngoscopy. Inclusion criteria are: ASA (American Society of Anesthesiologists) I and II classes; 17 - 80 years old patients undergoing elective suspension laryngoscopy without history of hypertension; no history of cerebrovascular accidents; no history of acute porphyria; no food allergy (specially to soya and egg). Exclusion criteria are: airway obstruction; laryngospasm; need to re-intubation after laryngoscope excitation; systolic blood pressure less than 90 mmHg at fifth minute and surgery duration more than 30 minutes. Patients were divided into three groups of Etomidate (received 0.3 mg/kg), Propofol (received 2.2 mg/kg) and Thiopental sodium (received 5 mg/kg) and hemodynamic parameters at 1, 3, 5, 10, 15 minutes after induction and 3, 5, 15, 30 minutes after recovery, surgeon's satisfaction of surgery, surgery duration and recovery time were measured. We understood that there is no difference between administration of Propofol, Etomidate and Thiopental sodium in terms of hemodynamic changes, surgeon's satisfaction of anesthesia and surgery duration.