NCLEX-RN Pharmacology Practice
Questions: 20 Gastrointestinal System
Medication Safety MCQs with Detailed
Rationales |
ATI & NGN Style Nursing Exam Prep
Question 1
Clinical Scenario
A 68-year-old client with a history of chronic constipation is
prescribed docusate sodium. The client asks the nurse how this
medication works to relieve their symptoms.
Question Stem
Which statement by the nurse provides the most accurate
information about docusate sodium?
A. "It draws water into the intestines to create a large, bulky stool."
B. "It stimulates the nerve endings in the colon to increase
peristalsis."
C. "It lowers the surface tension of stool, allowing water and fats to
penetrate."
D. "It coats the intestinal lining to soothe irritation and slow transit
time."
,Correct Answer
C. "It lowers the surface tension of stool, allowing water and fats to
penetrate."
Detailed Rationale
Docusate sodium is an emollient (stool softener) laxative. It works
by lowering the surface tension of the stool, allowing water and
lipids to penetrate, which softens the fecal mass and makes it easier
to pass without straining. Option A describes osmotic laxatives (e.g.,
polyethylene glycol), which draw water into the intestines. Option B
describes stimulant laxatives (e.g., senna, bisacodyl), which directly
irritate the bowel wall to increase peristalsis. Option D describes
protectants or antidiarrheals (e.g., bismuth subsalicylate). Nursing
consideration: Emollient laxatives do not stimulate peristalsis and
require adequate fluid intake to be effective. They are frequently
prescribed to prevent straining in clients with cardiovascular
conditions, hemorrhoids, or those recovering from surgery, making
patient education on hydration crucial for therapeutic success.
Therefore, the nurse should encourage the client to drink adequate
fluids daily unless contraindicated.
Learning Objective
• Describe the mechanism of action of emollient laxatives.
• Differentiate between classes of laxatives based on their
physiological effects.
• Educate clients on the necessity of adequate fluid intake when
using stool softeners.
,Medication Safety Focus
Patient education
Question 2
Clinical Scenario
A 55-year-old client has been taking omeprazole 40 mg daily for
gastroesophageal reflux disease (GERD) for the past 3 years. The
client presents to the clinic with new-onset muscle cramps,
palpitations, and a recent fall resulting in a wrist fracture.
Question Stem
Which laboratory value should the nurse prioritize reviewing to
determine the cause of these symptoms?
A. Serum magnesium
B. Serum sodium
C. Blood urea nitrogen (BUN)
D. Aspartate aminotransferase (AST)
Correct Answer
A. Serum magnesium
Detailed Rationale
Long-term use of proton pump inhibitors (PPIs) like omeprazole is
associated with hypomagnesemia, which can manifest as muscle
cramps, tremors, palpitations, and arrhythmias. Chronic PPI use
also decreases calcium absorption, increasing the risk of
osteoporosis and bone fractures, as seen in this client's wrist
fracture. While PPIs are metabolized by the liver, AST (Option D) is
not the priority for evaluating these specific symptoms. Serum
, sodium (Option B) and BUN (Option C) are not directly linked to the
classic long-term adverse effects of PPI therapy. The nurse should
advocate for checking serum magnesium and calcium levels, and
the provider may need to discontinue the PPI, switch to an H2-
receptor antagonist, or prescribe targeted mineral supplementation.
Routine monitoring of electrolytes is recommended for clients on
PPI therapy for longer than one year.
Learning Objective
• Identify the long-term adverse effects of proton pump inhibitor
therapy.
• Prioritize laboratory monitoring for clients on chronic PPI
regimens.
• Correlate clinical manifestations of electrolyte imbalances
with specific medication histories.
Medication Safety Focus
Monitoring
Question 3
Clinical Scenario
A 62-year-old client with liver cirrhosis is admitted with hepatic
encephalopathy. The provider prescribes lactulose 30 mL orally
every 6 hours. The client's current serum ammonia level is 110
mcg/dL (normal: 15-45 mcg/dL).
Questions: 20 Gastrointestinal System
Medication Safety MCQs with Detailed
Rationales |
ATI & NGN Style Nursing Exam Prep
Question 1
Clinical Scenario
A 68-year-old client with a history of chronic constipation is
prescribed docusate sodium. The client asks the nurse how this
medication works to relieve their symptoms.
Question Stem
Which statement by the nurse provides the most accurate
information about docusate sodium?
A. "It draws water into the intestines to create a large, bulky stool."
B. "It stimulates the nerve endings in the colon to increase
peristalsis."
C. "It lowers the surface tension of stool, allowing water and fats to
penetrate."
D. "It coats the intestinal lining to soothe irritation and slow transit
time."
,Correct Answer
C. "It lowers the surface tension of stool, allowing water and fats to
penetrate."
Detailed Rationale
Docusate sodium is an emollient (stool softener) laxative. It works
by lowering the surface tension of the stool, allowing water and
lipids to penetrate, which softens the fecal mass and makes it easier
to pass without straining. Option A describes osmotic laxatives (e.g.,
polyethylene glycol), which draw water into the intestines. Option B
describes stimulant laxatives (e.g., senna, bisacodyl), which directly
irritate the bowel wall to increase peristalsis. Option D describes
protectants or antidiarrheals (e.g., bismuth subsalicylate). Nursing
consideration: Emollient laxatives do not stimulate peristalsis and
require adequate fluid intake to be effective. They are frequently
prescribed to prevent straining in clients with cardiovascular
conditions, hemorrhoids, or those recovering from surgery, making
patient education on hydration crucial for therapeutic success.
Therefore, the nurse should encourage the client to drink adequate
fluids daily unless contraindicated.
Learning Objective
• Describe the mechanism of action of emollient laxatives.
• Differentiate between classes of laxatives based on their
physiological effects.
• Educate clients on the necessity of adequate fluid intake when
using stool softeners.
,Medication Safety Focus
Patient education
Question 2
Clinical Scenario
A 55-year-old client has been taking omeprazole 40 mg daily for
gastroesophageal reflux disease (GERD) for the past 3 years. The
client presents to the clinic with new-onset muscle cramps,
palpitations, and a recent fall resulting in a wrist fracture.
Question Stem
Which laboratory value should the nurse prioritize reviewing to
determine the cause of these symptoms?
A. Serum magnesium
B. Serum sodium
C. Blood urea nitrogen (BUN)
D. Aspartate aminotransferase (AST)
Correct Answer
A. Serum magnesium
Detailed Rationale
Long-term use of proton pump inhibitors (PPIs) like omeprazole is
associated with hypomagnesemia, which can manifest as muscle
cramps, tremors, palpitations, and arrhythmias. Chronic PPI use
also decreases calcium absorption, increasing the risk of
osteoporosis and bone fractures, as seen in this client's wrist
fracture. While PPIs are metabolized by the liver, AST (Option D) is
not the priority for evaluating these specific symptoms. Serum
, sodium (Option B) and BUN (Option C) are not directly linked to the
classic long-term adverse effects of PPI therapy. The nurse should
advocate for checking serum magnesium and calcium levels, and
the provider may need to discontinue the PPI, switch to an H2-
receptor antagonist, or prescribe targeted mineral supplementation.
Routine monitoring of electrolytes is recommended for clients on
PPI therapy for longer than one year.
Learning Objective
• Identify the long-term adverse effects of proton pump inhibitor
therapy.
• Prioritize laboratory monitoring for clients on chronic PPI
regimens.
• Correlate clinical manifestations of electrolyte imbalances
with specific medication histories.
Medication Safety Focus
Monitoring
Question 3
Clinical Scenario
A 62-year-old client with liver cirrhosis is admitted with hepatic
encephalopathy. The provider prescribes lactulose 30 mL orally
every 6 hours. The client's current serum ammonia level is 110
mcg/dL (normal: 15-45 mcg/dL).
