Title: Intramuscular ketorolac versus intramuscular diclofenac for post-operative analgesia in children undergoing lower abdominal surgery under spinal anesthesia Background: Sub-arachnoid block is an excellent anesthetic option in children, but, its use is limited due to short lasting action. Intrathecal bupivacaine with fentanyl and concurrent use of intramuscular NSAIDs improve the duration and quality of analgesia in adults. Aim of our study was to establish the same in children.