Rb Form Sodium is an antiulcerant drug in the class of Proton Pump Inhibitors. Rb Form Sodium is a substituted benzimidazole which suppresses gastric acid secretion by inhibiting the gastric H+/K+-ATPase enzyme at the secretory surface of the gastric parietal cell. It is an enteric coated tablet, because of its coated formulation it is highly stable in stomach and because of higher pKa value of Rb Form Sodium it provides faster onset of action. It blocks the final step of gastric acid secretion.