Paper II
2015 September (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Rabeprazole.

Q63 marksShort Notes

Answer

Rabeprazole is a proton pump inhibitor.

Mechanism of action

  • Prodrug, activated in the acidic parietal cell canaliculus
  • Irreversibly inhibits the H⁺/K⁺-ATPase (proton pump), the final common step in gastric acid secretion

Pharmacokinetic feature

  • Activated more rapidly and at a higher pH than other PPIs, giving a somewhat faster onset of acid suppression

Uses

  • Peptic ulcer disease, GERD, Zollinger-Ellison syndrome, H. pylori eradication regimens

Adverse effects

  • Headache, GI upset
  • Long-term: fracture risk, vitamin B12 deficiency, hypomagnesaemia, increased risk of C. difficile infection

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