Omeprazole (EC) 20mg is a medication primarily used to treat conditions related to excess stomach acid, such as gastroesophageal reflux disease (GERD), peptic ulcers, and Zollinger-Ellison syndrome. As a proton pump inhibitor (PPI), Omeprazole works by inhibiting the proton pumps in the stomach lining, which are responsible for producing gastric acid. This reduces acid secretion, helping to relieve symptoms like heartburn, acid reflux, and stomach discomfort. Omeprazole is also used in combination with antibiotics to treat Helicobacter pylori infections, which can contribute to ulcers. It is usually taken before meals and should be used as directed by a healthcare provider, as long-term use can have potential side effects such as nutrient deficiencies or an increased risk of certain infections.