Medical Definition of omeprazole
: a benzimidazole derivative C17H19N3O3S that inhibits gastric acid secretion and is used in the short-term treatment of duodenal and gastric ulcers as well as the treatment of gastroesophageal reflux, erosive esophagitis, and disorders (as Zollinger-Ellison syndrome) involving gastric acid hypersecretion—see prilosec
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