What it is

Prevacid (lansoprazole) is a proton pump inhibitor. Lansoprazole decreases the amount of acid produced in the stomach.

What it treats

Prevacid is used to treat and prevent stomach and intestinal ulcers, erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excessive stomach acid such as Zollinger-Ellison syndrome. Prevacid OTC (over-the-counter) is used to...