Generic Zantac is in a group of drugs called histamine-2 blockers. Generic Zantac works by reducing the amount of acid your stomach produces.
Generic Zantac is used to treat and prevent ulcers in the stomach and intestines. It also treats conditions in which the stomach produces too much acid, such as Zollinger-Ellison syndrome. Generic Zantac also treats gastroesophageal reflux disease (GERD) and other conditions in which acid backs up from the stomach into the esophagus, causing heartburn.