Objective: Postoperative pain following hip surgery can be severe. Non-steroidal anti-inflammatory drugs are used in the treatment of postoperative pain to reduce opioid consumption. Our aim was to investigate the effect of ibuprofen on postoperative opioid consumption following total hip replacement surgery. Methods: Patients undergoing elective total hip replacement under general anaesthesia were included into this randomised, prospective and double-blind study. Forty patients classified according to the American Society of Anesthesiologists as Class I and II were randomised to receive 800 mg ibuprofen intravenously (IV) every 6 hours, or placebo. At the end of surgery, all patients were also administered tramadol 100 mg IV and paracetamol 1 gm IV. In the postoperative period, all patients were provided with a morphine PCA device. The PCA device was set to deliver 1 mg bolus dose and had 8 minutes of lockout period and 6 mg 1-hour limit. VAS scores were recorded at 1, 6, 12 and 24 h postoperatively. The incidence of nausea and vomiting, total morphine consumption during the 24 h postoperative period was recorded. The Mann-Whitney U and chi-squared tests were used for statistical analysis.Results: The VAS score at postoperative 24 h was lower in the ibuprofen group (p=0.006). Morphine consumption at 24 hours was significantly lower at the ibuprofen group compared to the control group (p=0.026) (the mean doses were 16 mg and 24 mg, respectively). Five patients in the control group and 3 patients in the ibuprofen group reported vomiting. No other side effects or complications were observed.Conclusion: Following total hip replacement surgery, the administration of ibuprofen IV significantly reduced morphine consumption.