Rabeprazole is used to treat the symptoms of gastroesophageal reflux disease (GERD), a condition in which backward flow of acid from the stomach causes heartburn and possible injury of the esophagus (the tube that connects the throat and stomach) in adults and children 1 year of age and older. Rabeprazole is used to treat damage from GERD, allow the esophagus to heal, and prevent further damage to the esophagus in adults. Rabeprazole is also used to treat conditions in which the stomach produces too much acid, such as Zollinger-Ellison syndrome in adults. Rabeprazole is used to treat ulcers (sores in the lining of the stomach or intestine) and is used in combination with other medications to eliminate H. pylori, a bacteria that causes ulcers in adults. Rabeprazole is in a class of medications called proton-pump inhibitors.