Zantac (generic name: ranitidine; brand names include: Monorin / Histac / Ranitil) is in a class of medications called H2 blockers. It decreases the amount of acid made in the stomach. Reducing stomach acid helps to reduce heartburn, to heal irritation of the esophagus, and to heal ulcers of the stomach or intestines.
Zantac is used for treating certain conditions that cause your body to make too much stomach acid (eg, Zollinger-Ellison syndrome). It is also used to treat ulcers of the small intestine that have not responded to other treatment.
Zantac is effective for short-term and maintenance treatment of gastric ulcer and is also used to treat irritation and ulceration of the stomach caused by non-steroidal anti-inflammatory drugs.