Paper II
2018 July (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Peptic ulcer protective agents

Q53 marksShort Notes

Answer

Peptic ulcer protective (mucosal protective) agents enhance mucosal defence mechanisms rather than reducing acid secretion.

Examples and mechanisms

  • Sucralfate: Forms a viscous, adherent paste with ulcer base proteins in acidic environment, creating a physical barrier protecting the ulcer from acid/pepsin
  • Misoprostol (PGE1 analogue): Restores prostaglandin-mediated mucus/bicarbonate secretion and mucosal blood flow, particularly useful in NSAID-induced ulcers
  • Colloidal bismuth subcitrate: Forms a protective coating over the ulcer, also has some antibacterial activity against H. pylori

Uses

  • Peptic ulcer disease, particularly NSAID-induced ulcers (misoprostol), stress ulcer prophylaxis (sucralfate)

Adverse effects

  • Sucralfate: constipation, may impair absorption of other drugs (given at separate times)
  • Misoprostol: diarrhoea, abdominal cramps; contraindicated in pregnancy (abortifacient/uterotonic)

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