165 consecutive CCP patients admitted in our surgical gastro enterology department since January 2013 were screened for eligibility. 29 patients were excluded (28 were not meeting the inclusion criteria and 1 patient intra operatively found to have disseminated malignancy). After exclusion 136 patients were included in our study. They were randomized in to 2 groups, one group was treated by Frey's procedure with NCPB (Group-I) and the other by Frey's procedure with saline as placebo (Group-II). Method of Study is a randomized, double- blind, placebo- controlled, parallel arm, superiority trial.