Find patient medical information for Omeprazole (Prilosec, Prilosec OTC) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Dual Therapy Omeprazole delayed-release capsules in combination with clarithromycin are indicated for treatment of patients with H. pylori infection and duodenal ulcer disease to eradicate H. pylori in adults. Omeprazole (Prilosec) is a proton pump inhibitor that reduces stomach acid. It’s available both over the counter and with a prescription. Common omeprazole side effects include headaches and stomach-related side effects, such as nausea, vomiting, or diarrhea. 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 used to treat certain conditions where there is too much acid in the stomach. It is used to treat gastric and duodenal ulcers, erosive esophagitis, and gastroesophageal reflux disease (GERD). Omeprazole delayed-release capsules, USP are indicated for short-term treatment of active duodenal ulcer in adults. Most patients heal within four weeks. Some patients may require an additional four weeks of therapy. Omeprazole is used to treat excess stomach acid in conditions such as stomach ulcers, heartburn or gastroesophageal reflux disease (GERD), active duodenal ulcer, Zollinger-Ellison syndrome and erosive esophagitis. 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. What is this medication? OMEPRAZOLE (oh ME pray zol) is used to treat heartburn, stomach ulcers, reflux disease, or other conditions that cause too much stomach acid. It works by reducing the amount of acid in the stomach. It belongs to a group of medications called PPIs. Learn about the side effects of omeprazole, from common to rare, for consumers and healthcare professionals.