NCLEX-RN Pharmacology Gastrointestinal
System Exam Questions & Answers |
20 Original NGN/ATI-Style Practice MCQs
with Detailed Rationales
Question 1
Clinical Scenario
A 65-year-old female client with a history of gastroesophageal reflux
disease (GERD) has been taking omeprazole daily for the past 2
years. During a routine follow-up visit, the nurse reviews the client's
medication regimen and provides education on long-term therapy.
Question Stem
Which statement by the client indicates a need for further teaching
regarding long-term omeprazole therapy?
A. "I will report any new bone pain or fractures to my provider."
B. "I should take this medication 30 minutes before my first meal of
the day."
C. "I can stop taking this medication abruptly once my heartburn is
completely gone."
D. "I may need periodic monitoring of my magnesium and vitamin
B12 levels."
,Correct Answer
C. "I can stop taking this medication abruptly once my heartburn is
completely gone."
Detailed Rationale
Proton pump inhibitors (PPIs) like omeprazole should not be
stopped abruptly after long-term use due to the risk of rebound acid
hypersecretion, which can cause severe, worsening heartburn and
dyspepsia. Tapering the dose or transitioning to a histamine-2 (H2)
receptor antagonist before complete discontinuation is the
recommended clinical practice. Option A reflects correct
understanding, as long-term PPI use is associated with decreased
calcium absorption and an increased risk of bone fractures. Option
B is correct because PPIs are most effective when taken 30 to 60
minutes before the first meal of the day to inhibit active proton
pumps. Option D is also correct, as chronic PPI therapy can lead to
hypomagnesemia and decreased vitamin B12 absorption due to
reduced gastric acidity, requiring periodic laboratory monitoring.
Therefore, the client's statement about abrupt discontinuation
indicates a misunderstanding that requires further teaching.
Learning Objective
• Identify the risks associated with abrupt discontinuation of long-
term proton pump inhibitor therapy.
• Recognize the optimal timing for PPI administration to maximize
therapeutic efficacy.
• Educate patients on the potential long-term adverse effects of
PPIs, including bone fracture risk and nutrient deficiencies.
,Medication Safety Focus
Patient education / Adverse effect prevention
Question 2
Clinical Scenario
A 58-year-old male client receiving his first cycle of highly
emetogenic chemotherapy is prescribed ondansetron to prevent
nausea and vomiting. The client’s medical history includes a
documented prolonged QT interval on a previous
electrocardiogram.
Question Stem
Which action should the nurse take prior to administering the first
dose of ondansetron?
A. Administer an additional dose of lorazepam to manage the
client's anxiety.
B. Obtain a baseline 12-lead electrocardiogram (ECG).
C. Encourage the client to drink 500 mL of cranberry juice before the
infusion.
D. Assess the client's bowel sounds for hyperactivity.
Correct Answer
B. Obtain a baseline 12-lead electrocardiogram (ECG).
Detailed Rationale
Ondansetron is a serotonin (5-HT3) receptor antagonist used to
prevent chemotherapy-induced nausea and vomiting. A significant,
dose-dependent adverse effect of ondansetron is QT interval
prolongation, which can precipitate life-threatening arrhythmias
, such as torsades de pointes. For a client with a known history of a
prolonged QT interval, obtaining a baseline 12-lead ECG is a critical
priority nursing action before administration to assess cardiac risk
and guide safe dosing. Option A is incorrect because while
lorazepam may be used for anticipatory nausea, it does not address
the primary cardiac safety concern. Option C is incorrect because
cranberry juice has no specific role in mitigating ondansetron's
adverse effects and may interact with other medications. Option D
is incorrect because assessing for hyperactive bowel sounds is not a
priority; ondansetron commonly causes constipation, not
hyperactivity. Clinical judgment dictates prioritizing the prevention
of fatal arrhythmias in high-risk patients.
Learning Objective
• Recognize the cardiovascular risks associated with serotonin (5-
HT3) receptor antagonists.
• Prioritize nursing assessments for clients with preexisting cardiac
conditions receiving emetogenic chemotherapy.
• Implement appropriate monitoring parameters to prevent
medication-induced arrhythmias.
Medication Safety Focus
Black Box Warning / Monitoring parameters
Question 3
Clinical Scenario
A 45-year-old female client is admitted to the medical unit with
severe watery diarrhea, a temperature of 38.9°C (102°F), and
abdominal cramping. The client reports completing a 10-day course
System Exam Questions & Answers |
20 Original NGN/ATI-Style Practice MCQs
with Detailed Rationales
Question 1
Clinical Scenario
A 65-year-old female client with a history of gastroesophageal reflux
disease (GERD) has been taking omeprazole daily for the past 2
years. During a routine follow-up visit, the nurse reviews the client's
medication regimen and provides education on long-term therapy.
Question Stem
Which statement by the client indicates a need for further teaching
regarding long-term omeprazole therapy?
A. "I will report any new bone pain or fractures to my provider."
B. "I should take this medication 30 minutes before my first meal of
the day."
C. "I can stop taking this medication abruptly once my heartburn is
completely gone."
D. "I may need periodic monitoring of my magnesium and vitamin
B12 levels."
,Correct Answer
C. "I can stop taking this medication abruptly once my heartburn is
completely gone."
Detailed Rationale
Proton pump inhibitors (PPIs) like omeprazole should not be
stopped abruptly after long-term use due to the risk of rebound acid
hypersecretion, which can cause severe, worsening heartburn and
dyspepsia. Tapering the dose or transitioning to a histamine-2 (H2)
receptor antagonist before complete discontinuation is the
recommended clinical practice. Option A reflects correct
understanding, as long-term PPI use is associated with decreased
calcium absorption and an increased risk of bone fractures. Option
B is correct because PPIs are most effective when taken 30 to 60
minutes before the first meal of the day to inhibit active proton
pumps. Option D is also correct, as chronic PPI therapy can lead to
hypomagnesemia and decreased vitamin B12 absorption due to
reduced gastric acidity, requiring periodic laboratory monitoring.
Therefore, the client's statement about abrupt discontinuation
indicates a misunderstanding that requires further teaching.
Learning Objective
• Identify the risks associated with abrupt discontinuation of long-
term proton pump inhibitor therapy.
• Recognize the optimal timing for PPI administration to maximize
therapeutic efficacy.
• Educate patients on the potential long-term adverse effects of
PPIs, including bone fracture risk and nutrient deficiencies.
,Medication Safety Focus
Patient education / Adverse effect prevention
Question 2
Clinical Scenario
A 58-year-old male client receiving his first cycle of highly
emetogenic chemotherapy is prescribed ondansetron to prevent
nausea and vomiting. The client’s medical history includes a
documented prolonged QT interval on a previous
electrocardiogram.
Question Stem
Which action should the nurse take prior to administering the first
dose of ondansetron?
A. Administer an additional dose of lorazepam to manage the
client's anxiety.
B. Obtain a baseline 12-lead electrocardiogram (ECG).
C. Encourage the client to drink 500 mL of cranberry juice before the
infusion.
D. Assess the client's bowel sounds for hyperactivity.
Correct Answer
B. Obtain a baseline 12-lead electrocardiogram (ECG).
Detailed Rationale
Ondansetron is a serotonin (5-HT3) receptor antagonist used to
prevent chemotherapy-induced nausea and vomiting. A significant,
dose-dependent adverse effect of ondansetron is QT interval
prolongation, which can precipitate life-threatening arrhythmias
, such as torsades de pointes. For a client with a known history of a
prolonged QT interval, obtaining a baseline 12-lead ECG is a critical
priority nursing action before administration to assess cardiac risk
and guide safe dosing. Option A is incorrect because while
lorazepam may be used for anticipatory nausea, it does not address
the primary cardiac safety concern. Option C is incorrect because
cranberry juice has no specific role in mitigating ondansetron's
adverse effects and may interact with other medications. Option D
is incorrect because assessing for hyperactive bowel sounds is not a
priority; ondansetron commonly causes constipation, not
hyperactivity. Clinical judgment dictates prioritizing the prevention
of fatal arrhythmias in high-risk patients.
Learning Objective
• Recognize the cardiovascular risks associated with serotonin (5-
HT3) receptor antagonists.
• Prioritize nursing assessments for clients with preexisting cardiac
conditions receiving emetogenic chemotherapy.
• Implement appropriate monitoring parameters to prevent
medication-induced arrhythmias.
Medication Safety Focus
Black Box Warning / Monitoring parameters
Question 3
Clinical Scenario
A 45-year-old female client is admitted to the medical unit with
severe watery diarrhea, a temperature of 38.9°C (102°F), and
abdominal cramping. The client reports completing a 10-day course
