Background: Postoperative shivering is a common event of unknown etiology with an incidence of 5-65%. This study intended to compare the efficacy of tramadol with that of pethidine in controlling postanesthetic shivering. Methods: This double-blind clinical trial was performed on 300 consecutive patients underwent general anesthesia for elective cataract surgery. https://toyscyclers.shop/product-category/nursery/