27 * Department of Pharmacology, School of Pharmacy, Marmara University, T›bbiye Cad. No: 49 Haydarpafla, 81010 Istanbul, Turkey ° Corresponding author Opioid Control of Renal Excretion of Water and Sodium Summary : The kidneys act to regulate total body water and sodium via numerous neural and humoral mechanisms, including pathways that involve the renal sympathetic nerves, antidiuretic hormon...