Match the drug with its action?

List-I	List-II
Medication	Action
A. Sucralfate	I. Blocks H2 receptor
B. Aluminium - magnesium solutions	II. Neutralizes gastric acid and strengthens mucosal barrier
C. Ranitidine	III. Muscarinic agent
D. Dicyclomine Hydrochloride	IV. Form a viscid gel which adheres to ulcer surface

1. A

   A-I, B-II, C-III, D-IV

2. B

   A-IV, B-II, C-I, D-III

3. C

   A-IV, B-II, C-III, D-I

4. D

   A-III, B-IV, C-I, D-II

Appeared in: MNS 2024

Explanation

• Sucralfate (A) is an ulcer protective that polymerizes in acid to form a viscous, sticky gel that adheres to the ulcer crater, creating a physical barrier. This matches action IV.
• Aluminium-magnesium solutions (B) are antacids. They are weak bases that neutralize existing gastric acid. Aluminium also helps strengthen the mucosal barrier. This matches action II.
• Ranitidine (C) is a histamine H2-receptor antagonist. It blocks H2 receptors on parietal cells, which reduces the secretion of gastric acid. This matches action I.
• Dicyclomine Hydrochloride (D) is an anticholinergic/antimuscarinic agent. It relieves GI smooth muscle spasms by blocking muscarinic receptors. This matches action III.

Why Other Options Were Wrong

• Option A: This option incorrectly pairs Sucralfate with H2 receptor blocking and Dicyclomine with forming a protective gel. Sucralfate forms the gel, and Ranitidine is the H2 blocker.
• Option C: This option incorrectly pairs Ranitidine with being a muscarinic agent and Dicyclomine with H2 receptor blocking. Their mechanisms are switched.
• Option D: This option incorrectly pairs Sucralfate with muscarinic action and Aluminium-magnesium with forming a gel. This reverses the actions of Sucralfate and Dicyclomine and misattributes the action of antacids.

Related Visual

Clinical Relevance

• Nursing practice connection: Knowing Mechanism of action of common gastrointestinal medications helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Administering sucralfate requires specific timing. It should be given on an empty stomach, at least 1 hour before meals, as it needs an acidic environment (pH less than 4) to be activated. Giving it with antacids or H2-blockers will reduce its effectiveness.
• When administering antacids, it's crucial to separate them from other medications (e.g., tetracyclines, iron) by at least 2 hours to prevent impaired absorption of the other drugs.
• For patients with renal insufficiency, magnesium-containing antacids should be avoided or used with caution due to the risk of hypermagnesemia, as the kidneys are responsible for excreting magnesium.

How to Approach the Question

• First, analyze the question type. This is a 'Match the Following' question requiring knowledge of drug mechanisms.
• Take each drug from List-I one by one. For 'A. Sucralfate', recall its primary action. It's a mucosal protective agent that forms a gel over ulcers.
• Scan List-II to find the matching action. 'IV. Form a viscid gel which adheres to ulcer surface' is the correct match for Sucralfate. So, the correct answer must start with A-IV.
• Repeat this process for the next drug, 'B. Aluminium-magnesium solutions'. These are antacids that neutralize acid. This matches 'II. Neutralizes gastric acid...'. Now you know the answer must contain A-IV and B-II.
• Continue with 'C. Ranitidine', an H2 blocker, which matches 'I. Blocks H2 receptor'.
• Finally, confirm 'D. Dicyclomine Hydrochloride', an antispasmodic/anticholinergic, matches 'III. Muscarinic agent'.

Concept Tested & Keywords

• Concept Tested: Mechanism of action of common gastrointestinal medications.
• Stem keywords: Sucralfate, Aluminium - magnesium solutions, Ranitidine, Dicyclomine Hydrochloride, drug action
• Lead-in keywords: Match

Question ID

QtLEM9toPqsONQVT0UplWW

Copy ID

Reference Book

E6 Pharmacology Katzung 16e pp. 1703-1705, 1728-1730

E6 Pharmacology Nurses Shanbhag 3e p. 220-222