Final answer:
Omeprazole is a proton pump inhibitor commonly used to treat peptic ulcers caused by H. pylori infection. Higher doses of omeprazole may be required for certain conditions such as Zollinger-Ellison syndrome.
Step-by-step explanation:
Omeprazole, a proton pump inhibitor, is commonly used to treat peptic ulcers caused by infection with the bacterium Helicobacter pylori. It works by decreasing the amount of acid produced in the stomach. Higher doses of omeprazole may be required for treating patients with conditions such as Zollinger-Ellison syndrome, which is characterized by excessive stomach acid production.