Chronic consumption of soda energizing caffeine has known a growing success. Its deleterious effects, however, are often ignored. We report a case of tetraparesis associated with chronic excessive consumption of cola. The development of muscle weakness is variable, resulting from a hyperpolarization of excitable membranes. The outcome is most often favorable after potassium supplementation and interruption of the offending beverage consumption. The mechanisms involved are multiple and involve both a leakage of fecal and urinary potassium and a potassium entry into the intracellular compartment. Other mechanisms related to caffeine are also involved. It therefore appears mandatory to assess the consumption of such beverages in the presence of hypokalemia and muscle weakness.