NCIt definition : A benzimidazole with selective and irreversible proton pump inhibition activity. Omeprazole
forms a stable disulfide bond with the sulfhydryl group of the hydrogen-potassium
(H - K ) ATPase found on the secretory surface of parietal cells, thereby inhibiting
the final transport of hydrogen ions (via exchange with potassium ions) into the gastric
lumen and suppressing gastric acid secretion. This agent exhibits no anticholinergic
activities and does not antagonize histamine H2 receptors.;
Alternative definition : NCI-GLOSS: A drug that inhibits gastric acid secretion.;