Introduction: Caudal analgesia is reliable, safe and has become most popular and commomly performed regional blocks in pediatric infraumbilical surgeries but has a short duration of action without adjuvants. Dexmedetomidine a potent alpha 2 adernergic agonist, provides better hemodynamic stability and longer post operative analgesia than many other adjuvants. Ropivacaine a amide local anaesthetic, provides pain relief with less motor blockage with reduced central and cardiotoxic effects than bupivacaine. Hence study conducted with 2 groups ropivacaine alone (R) and ropivacine plus dexmedetomidine (RD) an adjuvant. Aims: Primary objective is to compare post operative analgesia between two groups, secondarily sedation. Methods: prospective, randomized study was carried out in 60 patients of ASA grade 1 and 2, aged between 2 and 8 yrs weighing <20 kg, scheduled in elective infraumbilical surgeries. In our study patients were divided into two groups of 30 each with the help of computer generated table of random numbers. Group R received 0.2% ropivacaine 1 ml/kg and Group RD received ropivacaine 0.2% 1 ml/kg plus dexmedetomidine 1 mcg/kg. Mean duration of caudal analgesia, mean duration of sedation and any other side effects were recorded in both the groups and compared. Result: The mean duration of caudal analgesia in group RD was 10.41 hrs while group R was 5.89 hrs and difference is statistically significant (p<0.001) and quality of sleep was better in group RD. Conclusion: Addition of dexmedetomidine to caudal blocks significantly prolongs post operative analgesia with arousable sedation without significant side effects.