Sedative and antiemetic effect of hydroxyzine as a premedicant were studied and results were compared with a placebo and Talwin. Two hundred and fourty patients were evaluated. These patients were divided into 6 groups. There were fourty patients in each group. Group 1: Hydroxyzine 50mg. Group 2: Hydroxyzine 100mg. Group 3: Placebo. Group 4: Talwin 20mg. Group 5: Hydroxyzine 5pmg plus Talwie 20mg. Group 6: Hydroxyzine 100mg plus Talwin 20mg. The results were as follows; 1) Satisfactory sedation was ovtained in 75% with group I, in 92.5% with group 2, in 30% with group 3, in 40% with group 4, in 82. 5% With group 5, and in 97. 5% with group 6. Better results were obtained with hydroxyzine plus Talwin group than hydroxyzine anly. 2) The incidence of postoperative nausea and vomiting in recovery room, 7. 5% wlth group 7. 5 % with group 3, 20% with group 4, 5%. with group 5. There was no case of nausea and vomiting in group 2 and group 6. We obtained a significant difference in antiemetic effect between Talwin only and the Talwin plus hydroxyzine group. 3) There was no adverse change on vital signs in all cases.