Calcitonin is an endogenous regulator of calcium homeostasis, which acts principally on bone. At present, the principal indications for the therapeutic use of calcitonin are disorders involving hypercalcemia Paget's disease, acute pancreatitis, high-bone-turnover osteoporosis, pain associated with osteoporosis or bone metastases, and Sudeck's atrophy. The aim of this study was to compare the analgesic effects on postoperative pain of salmon calcitonin versus opioids administered epidurally