Postoperative pain control is very important not only for the relief of pain. but in the prevention of respiratory acidosis, pulmonary complications, emotional disturbances and sleeping disturbances etc. Jn spite of its significance there are a few studies on postoperative pain control in medical literature. Techniques have been developed for postoperative pain control since the 19 century, for example analgesics, inhalational agents, regional block, hypnosis and accupuncture. However none of these techniques was satisfactory because of various complications. The intermittent intramuscular injection of narcotics (e.g. meperidine) has been used most widely pto the present. There have been many complications, induding addiction, from this method. Our study was done in the recovery room with intramuscular injections of Thalamonal to fully awake patients, with 20 cases each having operation done in the upper abdomen, lower abdomen, and in other sites. We evaluated the results for the requirement of meperidine after the adminstration of Thalamonal. This was compared with the control group. There were 85% of cases that did not require the injection of meperidine. One case was complicated by hypotension, but this patient was improved with routine management for hypotension. Other complications were not found.