In the Netherlands symptomatic gallstone patients are admitted to a waiting list for elective cholecystectomy by general surgeons. The waiting period may last several months because of logistic reasons. During this waiting period gallstone patients are at risk for biliary pain and complications. Therefore, we conducted a randomized, double-blind, placebo-controlled trial on effects of UDCA on biliary pain and complications in highly symptomatic gallstone patients scheduled for cholecystectomy. We also evaluated potential beneficial effects of impaired gallbladder motility