Buy Prevacid online to treat and help prevent stomach ulcers. This medication helps decrease the amount of acid that the stomach produces. By doing this, it helps control some of the symptoms that are experienced from intestinal and stomach ulcers, erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excessive stomach acid such as Zollinger-Ellison syndrome. This medication is known as a proton pump inhibitor (PPI) and it works by blocking acid production in the stomach.