Introduction: Adequate pain control remains a major challenge after ambulatory surgery. Midazolam as adjunct to local anaesthetics in caudal epidural analgesia has been found effective with minimal adverse effects. Objective: The study was carried out to evaluate the analgesic efficacy of caudal bupivacaine and midazolam in children undergoing genitourinary surgeryfor post operative analgesia and to study the side effects and complications of bupivacaine and midazolam. Subjects and methods: Sixty children, aged2-12 were randomly selected from routine cases of pediatric genitourinary surgery in NSCB Medical college and Hospital, Jabalpur.Group B receive 0.25% bupivacaine 0.5ml/kg [n=30] and group BM receive combination of 0.25% bupivacaine 0.5ml/kg with 50 microgm/kg midazolam[n=30].Throughout the study period heart rate,arterial BP, respiratory rate were monitored. Postoperative pain was assessed by MODIFIED TODDLER PRESCHOOLER POST OPERATIVE PAIN SCALE [TPPPS].Rescue analgesia was given when pain score was 4 or more than 4. Sedation was evaluated by four point sedation score. Results: Lowest pain score were observed in BM group. The mean duration of postoperative analgesia in group B was 7.6+1.5hrs and in group BM was 10.43+0.95 hrs’ which was statistically significant[p<0.05]. There was no significant changes in HR,BP and respiratory rate in both groups. The incidence of nausea and vomiting were equal in both groups. No respiratory depression,motor paralysis or urinary retention in both groups during the period of study. Conclusion- Caudal administration of bupivacaine , midazolam mixture prolongs postoperative analgesia compare to bupivacaine alone without causing any adverse effects and complications.