Efficacy of three doses of tramadol with bupivacaine for caudal analgesia in paediatric inguinal herniotomy

Caudal tramadol 2 mg kg−1, combined with bupivacaine 0.25% 0.75 ml kg−1, provided longer duration of postoperative analgesia and reduced requirement for rescue analgesic compared with tramadol 1 mg kg−1 or 1.5 mg kg−1 in children undergoing inguinal herniotomy.