NCLEX-RN Pharmacology
Gastrointestinal System Exam Questions
& Answers
20 NGN-Style GI Medication Safety
MCQs with Rationales
Question 1
Clinical Scenario
A 45-year-old client with gastroesophageal reflux disease
(GERD) has been prescribed omeprazole 40 mg orally once
daily. The client tells the nurse, "I usually take all my
medications right before bed."
Question Stem
Which instruction should the nurse provide regarding
omeprazole administration?
A. Take the medication immediately after meals.
B. Take the medication with an antacid at bedtime.
C. Take the medication 30–60 minutes before the first meal of
the day.
,D. Take the medication only when symptoms occur.
Correct Answer
Correct Answer: C. Take the medication 30–60 minutes before
the first meal of the day.
Detailed Rationale
Omeprazole is a proton pump inhibitor (PPI) that suppresses
gastric acid secretion by irreversibly inhibiting the hydrogen-
potassium ATPase pump in gastric parietal cells. PPIs are most
effective when taken 30–60 minutes before a meal, typically
breakfast, because proton pumps become activated during food
intake. Administering the medication before meals maximizes
drug effectiveness.
Option A is incorrect because taking omeprazole after meals
decreases optimal acid suppression. Option B is incorrect
because routine administration with antacids is unnecessary
and bedtime administration is generally less effective than pre-
meal dosing. Option D is incorrect because PPIs are not
intended for immediate symptom relief and should be taken
consistently as prescribed.
The nurse should educate clients that symptom improvement
may take several days. Long-term therapy may increase risks
such as osteoporosis-related fractures, hypomagnesemia, and
,vitamin B12 deficiency. Monitoring is particularly important in
older adults receiving prolonged treatment.
Learning Objective
After completing this question, the learner should be able to:
• Identify proper administration timing for proton pump
inhibitors.
• Explain how PPIs achieve therapeutic effects.
• Educate clients regarding consistent medication
adherence.
• Recognize long-term safety concerns associated with PPIs.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 72-year-old client is receiving aluminum hydroxide for
dyspepsia. The client also takes levothyroxine, digoxin, and
ciprofloxacin.
Question Stem
Which nursing action is most important when administering
aluminum hydroxide?
, A. Monitor blood glucose levels closely.
B. Administer all medications together to improve adherence.
C. Encourage a high-potassium diet.
D. Separate administration of other medications by several
hours.
Correct Answer
Correct Answer: D. Separate administration of other
medications by several hours.
Detailed Rationale
Aluminum-containing antacids can significantly reduce
absorption of many medications, including levothyroxine,
digoxin, fluoroquinolones, tetracyclines, and iron supplements.
The nurse should instruct the client to separate administration
by at least 2–4 hours depending on the medication involved.
Option A is incorrect because aluminum hydroxide does not
directly affect blood glucose. Option B is unsafe because
coadministration may reduce therapeutic effectiveness of
essential medications. Option C is unrelated to the primary
safety concern.
Older adults are particularly vulnerable to medication
interactions due to polypharmacy. The nurse should perform
Gastrointestinal System Exam Questions
& Answers
20 NGN-Style GI Medication Safety
MCQs with Rationales
Question 1
Clinical Scenario
A 45-year-old client with gastroesophageal reflux disease
(GERD) has been prescribed omeprazole 40 mg orally once
daily. The client tells the nurse, "I usually take all my
medications right before bed."
Question Stem
Which instruction should the nurse provide regarding
omeprazole administration?
A. Take the medication immediately after meals.
B. Take the medication with an antacid at bedtime.
C. Take the medication 30–60 minutes before the first meal of
the day.
,D. Take the medication only when symptoms occur.
Correct Answer
Correct Answer: C. Take the medication 30–60 minutes before
the first meal of the day.
Detailed Rationale
Omeprazole is a proton pump inhibitor (PPI) that suppresses
gastric acid secretion by irreversibly inhibiting the hydrogen-
potassium ATPase pump in gastric parietal cells. PPIs are most
effective when taken 30–60 minutes before a meal, typically
breakfast, because proton pumps become activated during food
intake. Administering the medication before meals maximizes
drug effectiveness.
Option A is incorrect because taking omeprazole after meals
decreases optimal acid suppression. Option B is incorrect
because routine administration with antacids is unnecessary
and bedtime administration is generally less effective than pre-
meal dosing. Option D is incorrect because PPIs are not
intended for immediate symptom relief and should be taken
consistently as prescribed.
The nurse should educate clients that symptom improvement
may take several days. Long-term therapy may increase risks
such as osteoporosis-related fractures, hypomagnesemia, and
,vitamin B12 deficiency. Monitoring is particularly important in
older adults receiving prolonged treatment.
Learning Objective
After completing this question, the learner should be able to:
• Identify proper administration timing for proton pump
inhibitors.
• Explain how PPIs achieve therapeutic effects.
• Educate clients regarding consistent medication
adherence.
• Recognize long-term safety concerns associated with PPIs.
Medication Safety Focus
Medication administration
Question 2
Clinical Scenario
A 72-year-old client is receiving aluminum hydroxide for
dyspepsia. The client also takes levothyroxine, digoxin, and
ciprofloxacin.
Question Stem
Which nursing action is most important when administering
aluminum hydroxide?
, A. Monitor blood glucose levels closely.
B. Administer all medications together to improve adherence.
C. Encourage a high-potassium diet.
D. Separate administration of other medications by several
hours.
Correct Answer
Correct Answer: D. Separate administration of other
medications by several hours.
Detailed Rationale
Aluminum-containing antacids can significantly reduce
absorption of many medications, including levothyroxine,
digoxin, fluoroquinolones, tetracyclines, and iron supplements.
The nurse should instruct the client to separate administration
by at least 2–4 hours depending on the medication involved.
Option A is incorrect because aluminum hydroxide does not
directly affect blood glucose. Option B is unsafe because
coadministration may reduce therapeutic effectiveness of
essential medications. Option C is unrelated to the primary
safety concern.
Older adults are particularly vulnerable to medication
interactions due to polypharmacy. The nurse should perform
