Omeprazole is a proton pump inhibitor that is used to treat symptoms of gastroesophageal reflux disease and other conditions caused by excess stomach acid. Easy-to-read patient tips for omeprazole covering how it works, benefits, risks, and best practices. NHS information about the medicine omeprazole, including what it's used for, who can take it, how to take it and side effects. Omeprazole is also used to treat dyspepsia, a condition that causes sour stomach, belching, heart burn, or indigestion. In addition, omeprazole is used to prevent upper gastrointestinal tract bleeding in seriously ill patients. Omeprazole is a proton pump inhibitor (PPI). It works by decreasing the amount of acid produced by the stomach. Omeprazole is used for a variety of digestive issues, such as acid reflux. Several omeprazole side effects are possible, though dietary changes may help. Most people can safely take omeprazole for a few weeks, depending on why you’re taking it. Learn about long-term use of omeprazole here. Omeprazole, sold under the brand names Prilosec and Losec among others, is a medication used in the treatment of gastroesophageal reflux disease (GERD), peptic ulcer disease, and Zollinger–Ellison syndrome. [1] It is also used to prevent upper gastrointestinal bleeding in people who are at high risk. [1] Omeprazole is a proton-pump inhibitor (PPI) and its effectiveness is similar to that of. Find patient medical information for Omeprazole (Prilosec, Prilosec OTC) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Omeprazole is a medication that reduces the amount of acid in your stomach. It treats heartburn, stomach ulcers and reflux disease. How does omeprazole work? The way a drug works is known medically as its mechanism of action. With certain digestive conditions, stomach acid damages your stomach lining and esophagus.