NCLEX-RN Pharmacology Gastrointestinal
System Practice Questions |
20 ATI & NGN-Style MCQs with Detailed
Rationales |
Nursing Exam Study Guide
Question 1
Clinical Scenario
A 55-year-old male client is newly diagnosed with gastroesophageal
reflux disease (GERD) and is prescribed omeprazole 20 mg orally
once daily.
Question Stem
Which statement by the client indicates understanding of the
teaching regarding omeprazole administration?
A. "I will take this medication right before going to bed at night."
B. "I will take this medication 30 to 60 minutes before my first meal
of the day."
C. "I will crush the delayed-release capsule and mix it with
applesauce to make it easier to swallow."
,D. "I will take this medication immediately after a heavy meal to
prevent heartburn."
Correct Answer
Correct Answer: B. "I will take this medication 30 to 60 minutes
before my first meal of the day."
Detailed Rationale
The correct answer is B. Proton pump inhibitors (PPIs) such as
omeprazole are most effective when administered 30 to 60 minutes
before the first meal of the day. This timing allows the medication to
reach peak blood levels just as the proton pumps are activated by
food ingestion, maximizing gastric acid suppression. Option A is
incorrect because taking PPIs at bedtime does not align with meal-
stimulated pump activation and is less effective for daytime acid
control, though bedtime dosing is sometimes used for nocturnal
symptoms with H2 receptor antagonists. Option C is incorrect
because omeprazole delayed-release capsules contain enteric-
coated granules that must not be crushed or chewed, as stomach
acid will destroy the medication before it can be absorbed in the
intestines. Option D is incorrect because taking the medication after
a meal significantly reduces its bioavailability and therapeutic
efficacy. Nursing considerations include assessing the client for
long-term PPI use risks, such as decreased bone mineral density,
hypomagnesemia, and increased risk of Clostridioides difficile
infection. Patient teaching should emphasize adherence to the
prescribed timing.
Learning Objective
After completing this question, the learner should be able to:
,• Identify the optimal timing for proton pump inhibitor
administration.
• Explain the pharmacokinetic rationale for taking PPIs before
meals.
• Educate patients on the proper handling of delayed-release
capsules.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 68-year-old female client with a history of prolonged QT interval is
receiving her third cycle of chemotherapy and is prescribed
ondansetron 8 mg IV for nausea prevention.
Question Stem
Which action should the nurse take prior to administering
ondansetron IV?
A. Administer a prophylactic dose of diphenhydramine to prevent an
allergic reaction.
B. Ensure the client has eaten a full meal to prevent gastric irritation.
C. Review the client's most recent electrocardiogram (ECG) results.
D. Check the client's fasting blood glucose level.
Correct Answer
Correct Answer: C. Review the client's most recent
electrocardiogram (ECG) results.
, Detailed Rationale
The correct answer is C. Ondansetron, a serotonin (5-HT3) receptor
antagonist, carries a risk of dose-dependent QT interval
prolongation, which can lead to life-threatening arrhythmias such as
torsades de pointes. For a client with a known history of prolonged
QT interval, reviewing the most recent ECG is a critical priority
nursing action before administration to ensure the QTc is within a
safe range. Option A is incorrect because ondansetron has a low risk
of allergic reactions, and prophylactic diphenhydramine is not
routinely indicated. Option B is incorrect because ondansetron can
be given regardless of meal status, and eating a full meal is not a
prerequisite for IV administration. Option D is incorrect because
ondansetron does not significantly affect blood glucose levels.
Nursing considerations include monitoring for signs of arrhythmias
(e.g., dizziness, palpitations, syncope) and avoiding concurrent use
of other QT-prolonging medications when possible.
Learning Objective
After completing this question, the learner should be able to:
• Recognize the risk of QT prolongation associated with
ondansetron.
• Prioritize ECG monitoring for clients with cardiac history receiving
antiemetics.
• Identify appropriate nursing interventions to prevent medication-
induced arrhythmias.
Medication Safety Focus
Adverse effect / Monitoring
System Practice Questions |
20 ATI & NGN-Style MCQs with Detailed
Rationales |
Nursing Exam Study Guide
Question 1
Clinical Scenario
A 55-year-old male client is newly diagnosed with gastroesophageal
reflux disease (GERD) and is prescribed omeprazole 20 mg orally
once daily.
Question Stem
Which statement by the client indicates understanding of the
teaching regarding omeprazole administration?
A. "I will take this medication right before going to bed at night."
B. "I will take this medication 30 to 60 minutes before my first meal
of the day."
C. "I will crush the delayed-release capsule and mix it with
applesauce to make it easier to swallow."
,D. "I will take this medication immediately after a heavy meal to
prevent heartburn."
Correct Answer
Correct Answer: B. "I will take this medication 30 to 60 minutes
before my first meal of the day."
Detailed Rationale
The correct answer is B. Proton pump inhibitors (PPIs) such as
omeprazole are most effective when administered 30 to 60 minutes
before the first meal of the day. This timing allows the medication to
reach peak blood levels just as the proton pumps are activated by
food ingestion, maximizing gastric acid suppression. Option A is
incorrect because taking PPIs at bedtime does not align with meal-
stimulated pump activation and is less effective for daytime acid
control, though bedtime dosing is sometimes used for nocturnal
symptoms with H2 receptor antagonists. Option C is incorrect
because omeprazole delayed-release capsules contain enteric-
coated granules that must not be crushed or chewed, as stomach
acid will destroy the medication before it can be absorbed in the
intestines. Option D is incorrect because taking the medication after
a meal significantly reduces its bioavailability and therapeutic
efficacy. Nursing considerations include assessing the client for
long-term PPI use risks, such as decreased bone mineral density,
hypomagnesemia, and increased risk of Clostridioides difficile
infection. Patient teaching should emphasize adherence to the
prescribed timing.
Learning Objective
After completing this question, the learner should be able to:
,• Identify the optimal timing for proton pump inhibitor
administration.
• Explain the pharmacokinetic rationale for taking PPIs before
meals.
• Educate patients on the proper handling of delayed-release
capsules.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 68-year-old female client with a history of prolonged QT interval is
receiving her third cycle of chemotherapy and is prescribed
ondansetron 8 mg IV for nausea prevention.
Question Stem
Which action should the nurse take prior to administering
ondansetron IV?
A. Administer a prophylactic dose of diphenhydramine to prevent an
allergic reaction.
B. Ensure the client has eaten a full meal to prevent gastric irritation.
C. Review the client's most recent electrocardiogram (ECG) results.
D. Check the client's fasting blood glucose level.
Correct Answer
Correct Answer: C. Review the client's most recent
electrocardiogram (ECG) results.
, Detailed Rationale
The correct answer is C. Ondansetron, a serotonin (5-HT3) receptor
antagonist, carries a risk of dose-dependent QT interval
prolongation, which can lead to life-threatening arrhythmias such as
torsades de pointes. For a client with a known history of prolonged
QT interval, reviewing the most recent ECG is a critical priority
nursing action before administration to ensure the QTc is within a
safe range. Option A is incorrect because ondansetron has a low risk
of allergic reactions, and prophylactic diphenhydramine is not
routinely indicated. Option B is incorrect because ondansetron can
be given regardless of meal status, and eating a full meal is not a
prerequisite for IV administration. Option D is incorrect because
ondansetron does not significantly affect blood glucose levels.
Nursing considerations include monitoring for signs of arrhythmias
(e.g., dizziness, palpitations, syncope) and avoiding concurrent use
of other QT-prolonging medications when possible.
Learning Objective
After completing this question, the learner should be able to:
• Recognize the risk of QT prolongation associated with
ondansetron.
• Prioritize ECG monitoring for clients with cardiac history receiving
antiemetics.
• Identify appropriate nursing interventions to prevent medication-
induced arrhythmias.
Medication Safety Focus
Adverse effect / Monitoring
