Pharmacology · single question
What is the mechanism of action of omeprazole?
Show answer and explanation
Correct answer: B. Proton pump inhibitor (PPI)
- A. H2 blockers (e.g., ranitidine) act on histamine receptors, not the proton pump.
- B. Correct. Omeprazole irreversibly inhibits the H+/K+ ATPase (proton pump) of gastric parietal cells.
- C. Antacids chemically neutralize existing acid; they don't inhibit secretion.
- D. Prokinetics speed gastric emptying; unrelated mechanism.