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Gastrointestinal Drugs

H2 Blockers Practice Questions

20 free H2 Blockers practice questions for the Pharmacology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All H2 Blockers questions

20 questions
  1. Q1. What is the primary mechanism of action of H2-receptor antagonists (H2RAs)?
  2. Q2. Which of the following H2 blockers is well known for inhibiting multiple Cytochrome P450 (CYP) enzymes, leading to many drug interactions?
  3. Q3. Which H2 blocker is associated with anti-androgenic side effects, such as gynecomastia and impotence in men?
  4. Q4. Compared to Proton Pump Inhibitors (PPIs), H2 blockers are generally considered:
  5. Q5. A patient develops 'tachyphylaxis' within 2–6 days of starting an H2 blocker. What does this term imply in this context?
  6. Q6. Which H2-receptor antagonist has the highest potency and the longest duration of action among the following?
  7. Q7. H2 blockers are particularly effective at inhibiting which type of gastric acid secretion?
  8. Q8. Which of the following H2RAs is primarily eliminated by the kidneys and has nearly 100% oral bioavailability?
  9. Q9. In elderly patients, high doses of Cimetidine can occasionally cause which central nervous system side effect?
  10. Q10. Why is dose adjustment necessary for H2 blockers in patients with chronic kidney disease?
  11. Q11. H2-receptor antagonists are less effective than PPIs at healing which of the following conditions?
  12. Q12. Which of the following is a potential consequence of chronic H2 blocker use regarding vitamin B12?
  13. Q13. How do H2RAs affect the secretion of pepsin?
  14. Q14. A patient is taking Cimetidine along with Warfarin. What is the most likely outcome for the patient's INR?
  15. Q15. Which statement regarding the use of H2RAs in pregnancy is most accurate?
  16. Q16. Which H2 blocker was largely withdrawn from many markets due to the discovery of NDMA (a potential carcinogen) in its formulations?
  17. Q17. In the management of an acute allergic reaction (anaphylaxis), H2 blockers are sometimes used as adjunctive therapy because:
  18. Q18. What happens to gastric pH after a single dose of an H2 blocker?
  19. Q19. Which of the following describes the 'acid rebound' phenomenon associated with H2RAs?
  20. Q20. H2 blockers are frequently used in hospitalized patients primarily to prevent which condition?