Paper II
2025 August (Supplementary) (2010 Scheme)

Question

Omeprazole

Q73 marksShort Notes

Answer

Omeprazole is a proton pump inhibitor.

MOA: a prodrug that accumulates in the acidic parietal cell canaliculus, converts to its active sulfenamide form, and irreversibly binds H⁺/K⁺-ATPase, blocking the final common step of gastric acid secretion regardless of the stimulating pathway.

Uses: peptic ulcer disease, GERD, H. pylori eradication (triple therapy), Zollinger-Ellison syndrome.

Adverse effects: generally well tolerated short-term; long-term use — hypomagnesemia, increased fracture risk, vitamin B12 deficiency, increased susceptibility to enteric infections including C. difficile.

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