NCIt definition : A potassium-competitive acid blocker (P-CAB), with acid suppressing activity. Upon
oral administration, vonoprazan concentrates in the gastric parietal cells and competitively
and reversibly binds to the potassium binding site of the proton pump hydrogen-potassium
adenosine triphosphatase (H /K ATPase), thereby inhibiting the pump's activity and
the parietal cell secretion of H ions into the gastric lumen, the final step in gastric
acid production. By inhibiting gastric acid secretion, vonoprazan provides relief
and healing in the treatment of various conditions, such as gastroduodenal ulcers
and reflux esophagitis.;