Tramadol vs.Tramadol With Paracetamol

Inclusion Criteria: American Society of Anesthesiologists (ASA) 1 or 2 status patients with single level lumbar disc herniation. Exclusion Criteria: Patients who could not use a patient controlled analgesia (PCA) device, known allergies to any of the drugs used in this study,hepatic and renal dysfunction, herniated disc with neurological deficit or intense pain justifying emergency surgery and the patients whose body mass index is ≥30 kg/m2 were excluded from the study.