Most common drug used in diarrhoea?

Appeared in: SGPGI Nursing Officer-2022

Explanation

Loperamide is a synthetic opioid agonist that acts peripherally on the μ-opioid receptors in the intestinal wall.
This action inhibits peristalsis (gut movement) and reduces intestinal secretions.
Slowing down the transit time allows for increased absorption of water and electrolytes from the stool, making it less watery and frequent.
It is widely available over-the-counter (OTC) and is a first-line choice for non-infectious, non-bloody acute diarrhea in adults due to its efficacy and low potential for abuse as it does not cross the blood-brain barrier.

Option B: Disulfiram is used to manage alcohol dependence by creating an unpleasant reaction to alcohol consumption. It has no therapeutic effect on the gastrointestinal system for treating diarrhea.
Option C: Acetaminophen is a pain reliever (analgesic) and fever reducer (antipyretic). It does not affect intestinal motility or secretions and is therefore ineffective for diarrhea.
Option D: Atropine is an anticholinergic agent. While it can decrease GI motility, it is not used as a standalone primary treatment for diarrhea due to significant side effects. Its main role in this context is as an additive to diphenoxylate (Lomotil) to prevent abuse.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological management of diarrhea helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The primary nursing intervention for diarrhea is to prevent and manage dehydration by encouraging oral rehydration solutions (ORS).
Nurses must assess for signs of dehydration (e.g., poor skin turgor, dry mucous membranes, decreased urine output, tachycardia) and monitor fluid intake and output.
Patient education is crucial: advise patients to avoid antimotility agents like loperamide if they have bloody diarrhea, high fever, or signs of a severe bacterial infection, as slowing gut transit can worsen the infection.

How to Approach the Question

First, identify the core of the question: it asks for the 'most common' drug for diarrhea.
Next, review the options and classify each drug based on its primary therapeutic use.
Loperamide is an antidiarrheal. Disulfiram is for alcohol abuse. Acetaminophen is for pain/fever. Atropine is an anticholinergic with multiple uses, but not primarily for diarrhea.
Recall that Loperamide (Imodium) is a very common over-the-counter medication specifically for diarrhea.
Eliminate the other options based on their primary indications, which do not match the treatment of diarrhea.
Confirm Loperamide as the correct choice because its mechanism directly addresses the symptoms of diarrhea by slowing gut motility.

Concept Tested & Keywords

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E6 Pharmacology Nurses Shanbhag 3e p. 213-215

E6 Pharmacology Nursing Lilley 11e Part 3 pp. 175-177, 176-178

Practise the full SGPGI Nursing Officer-2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.