Lazo 500mg Tablets (100s) typically contain the active ingredient Lansoprazole, which is a proton pump inhibitor (PPI). It is used to treat conditions related to excess stomach acid, such as acid reflux (GERD), peptic ulcers, and Zollinger-Ellison syndrome. Lansoprazole works by reducing the amount of acid produced in the stomach, providing relief from symptoms like heartburn and aiding in the healing of ulcers.