Previous studies had determined the role played by L-carnitine and simvastatin in the treatment of altered lipidemia in dialyzed patients with chronic uremia. The authors carried out a study on the above substances either singly or together administered to the same patients with chronic uremia in hemodialysis. This study was aimed at demonstrating the possible synergic normolipidemic action of both substances in comparison with their single administration, because their different mechanism of action could be metabolically enhanced. The obtained results demonstrated that the therapeutic association proposed is preferable to the use of the single substances. Moreover, a higher and more rapid normolipidemic effect was obtained after using L-carnitina associated with simvastatin with respect to the separated substances.