If gut motility is increased then?

RRB Staff Nurse Delhi-2015

Pharmacology

Medium

Appeared in: RRB Staff Nurse Delhi-2015

Explanation

The primary site for the absorption of most oral drugs is the small intestine.
Increased gut motility (hypermotility) causes the drug to pass through the small intestine more quickly than normal.
This rapid transit reduces the duration of contact between the drug and the absorptive surface of the intestinal mucosa.
Insufficient contact time leads to incomplete absorption of the drug, thereby decreasing its overall bioavailability (the fraction of the drug that reaches systemic circulation).

Option B: This is generally incorrect. While faster gastric emptying can sometimes increase the rate (speed of onset) of absorption by delivering the drug to the small intestine sooner, a generalized increase in gut motility reduces the extent (total amount) of absorption.
Option C: This is incorrect. Gut motility is a well-established and critical factor that influences the pharmacokinetics of orally administered drugs.
Option D: This is incorrect. The relationship between increased gut motility and decreased drug absorption is a predictable and fundamental principle of pharmacology.

Visual 1: Diagram: Comparing drug transit time in the GI tract during normal motility versus hypermotility. The visual should show the drug having less contact with the small intestine wall in the hypermotility example.
Visual 2: Infographic: Illustrating factors that affect drug absorption, highlighting GI motility, pH, blood flow, and presence of food.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacokinetics: Effect of GI motility on drug absorption as background academic context rather than a clinical decision trigger.
Nurses must assess for conditions that alter gut motility, such as diarrhea or constipation, as this can significantly impact the effectiveness of a patient's oral medications.
When administering medications, be aware that prokinetic agents (like metoclopramide) can decrease the absorption of other drugs, while antimotility agents (like loperamide) can increase it.
Patient education should include advising patients to report episodes of severe diarrhea, as their prescribed medication dosages may need adjustment to ensure therapeutic levels are maintained.

How to Approach the Question

First, identify the core physiological process in the question: increased gut motility.
Next, recall the principles of pharmacokinetics, specifically how oral drugs are absorbed. The key site is the small intestine, and absorption requires time.
Connect the change (increased motility) to the process (absorption). Increased motility means things move through the gut faster.
Deduce the consequence: Faster movement means less time for the drug to be in contact with the absorptive intestinal wall.
Conclude that less contact time results in less absorption. This leads directly to the correct answer.

Concept Tested & Keywords

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