Omeprazole, approved by the FDA, is available as a prescription and over-the-counter (OTC) drug used as a treatment for frequent heartburn. Learn about side effects, drug interactions, dosages, warnings, and more. Omeprazole is a medication that reduces the amount of acid in your stomach. It treats heartburn, stomach ulcers and reflux disease. NHS information about the medicine omeprazole, including what it's used for, who can take it, how to take it and side effects. View omeprazole information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding, monitoring requirements and important safety information. Learn about the side effects of omeprazole, from common to rare, for consumers and healthcare professionals. 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] 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. 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 proton pump inhibitor used to reduce excess stomach acid in heartburn (GERD), stomach ulcers, duodenal ulcers, erosive esophagitis, and other conditions Omeprazole oral capsule is a prescription drug that reduces the amount of acid in your stomach. It’s used to treat gastric or duodenal ulcers, GERD, erosive esophagitis, and hypersecretory.