Background: Uric acid is the end product of purine metabolism in humans and its increased level in serum leads to hyperuricemia. Among the different regulatory factors to control the level of uric acid in humans, xanthine oxidase (XO) is a well-established pharmacological target, as it is directly involved in uric acid production. Keywords: Dinuclear cyclam complex, xanthine oxidase inhibition, hyperuricemia, gout, uric acid, purine metabolism.