Postoperative analgesia using propacetamol was studied in 50 patients, 42 +/- 16 years old, after little or moderate surgery. Two grams of propacetamol in intravenous perfusion were administered every six hours. Three scales were utilized to note the intensity of the pain (simple verbal, behavioral and visual analogue scales), before the first injection and, one, four, six hours after. From this study, satisfactory analgesic efficiency and good tolerance of propacetamol were established.