Which medication is a proton pump inhibitor?

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Multiple Choice

Which medication is a proton pump inhibitor?

Proton pump inhibitors suppress gastric acid secretion by blocking the final step of acid production in the stomach. They target the H+/K+-ATPase enzyme on the surface of parietal cells, and because this pump is inhibited irreversibly, acid output remains reduced until new pumps are synthesized. Omeprazole is a proton pump inhibitor; it’s a prodrug that becomes active in the acidic environment of the parietal cell canaliculi and forms a covalent bond with the pump, producing substantial and long-lasting acid suppression. This makes it particularly effective for conditions like GERD, peptic ulcers, and NSAID-related ulcers, and it’s often used as part of H. pylori eradication regimens. In contrast, cimetidine and ranitidine are H2 receptor antagonists; they reduce acid secretion by blocking histamine action on parietal cells, which is effective but typically less potent and shorter-acting than PPIs. Sucralfate, on the other hand, acts as a mucosal protectant that forms a barrier over ulcers rather than suppressing acid production.

Proton pump inhibitors suppress gastric acid secretion by blocking the final step of acid production in the stomach. They target the H+/K+-ATPase enzyme on the surface of parietal cells, and because this pump is inhibited irreversibly, acid output remains reduced until new pumps are synthesized. Omeprazole is a proton pump inhibitor; it’s a prodrug that becomes active in the acidic environment of the parietal cell canaliculi and forms a covalent bond with the pump, producing substantial and long-lasting acid suppression. This makes it particularly effective for conditions like GERD, peptic ulcers, and NSAID-related ulcers, and it’s often used as part of H. pylori eradication regimens.

In contrast, cimetidine and ranitidine are H2 receptor antagonists; they reduce acid secretion by blocking histamine action on parietal cells, which is effective but typically less potent and shorter-acting than PPIs. Sucralfate, on the other hand, acts as a mucosal protectant that forms a barrier over ulcers rather than suppressing acid production.

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