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NCLEX RN Exam Bank: GI Pharmacotherapy,
PPIs, Laxatives & Electrolyte Replacement
Table of Contents
Subtopic 1: Proton Pump Inhibitors (PPIs) – Mechanisms, Indications & Safe Use .............. 2
Subtopic 2: Laxatives—Types, Indications, and Nursing Considerations ............................ 9
Subtopic 3: Electrolyte Replacement—GI Losses, Routes, and Safety ............................. 17
Subtopic 4: Polypharmacy & Drug Interactions in GI Pharmacotherapy ........................... 25
Subtopic 5: GI Electrolyte Imbalances—Identification, Correction, and Monitoring.......... 34
Subtopic 6: Bowel Regimens in Postoperative and Elderly Patients ................................. 42
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Subtopic 1: Proton Pump Inhibitors (PPIs) – Mechanisms,
Indications & Safe Use
(Questions 1–20)
1. A patient with GERD is prescribed omeprazole. What is the primary mechanism of action
of omeprazole?
A. Inhibits hydrogen-potassium ATPase in gastric parietal cells
B. Neutralizes stomach acid by forming a base
C. Blocks histamine-2 receptors in the stomach lining
D. Increases mucus secretion in the stomach
Correct Answer: A. Inhibits hydrogen-potassium ATPase in gastric parietal cells
Rationale: Omeprazole is a PPI that suppresses gastric acid secretion by irreversibly
inhibiting the H+/K+ ATPase enzyme system in the parietal cells.
2. Which of the following is a common long-term risk associated with chronic PPI use?
A. Iron overload
B. Vitamin B12 deficiency
C. Hypoglycemia
D. Hyperkalemia
Correct Answer: B. Vitamin B12 deficiency
Rationale: Chronic suppression of stomach acid may impair vitamin B12 absorption,
increasing the risk of deficiency.
3. A nurse is reviewing discharge instructions for a patient taking pantoprazole. Which
statement requires further education?
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A. "I will take this medication before breakfast."
B. "I can crush the tablet if I have trouble swallowing."
C. "This medication reduces stomach acid production."
D. "I should notify my provider if I develop diarrhea."
Correct Answer: B. "I can crush the tablet if I have trouble swallowing."
Rationale: PPIs like pantoprazole are enteric-coated and should not be crushed, as this
alters the drug's effectiveness.
4. For a patient taking omeprazole, which condition should be monitored due to increased
risk?
A. Peptic ulcer
B. Clostridioides difficile infection
C. Hypertension
D. Asthma
Correct Answer: B. Clostridioides difficile infection
Rationale: PPI use can alter gut flora and increase susceptibility to infections like C.
difficile.
5. Esomeprazole is most effective when taken:
A. At bedtime
B. With food
C. 30–60 minutes before meals
D. After experiencing reflux
Correct Answer: C. 30–60 minutes before meals
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Rationale: PPIs are best absorbed and most effective when taken before meals, allowing
suppression of acid before food triggers secretion.
6. Which of the following lab results would be most concerning for a patient on long-term
PPI therapy?
A. Sodium 139 mEq/L
B. Glucose 92 mg/dL
C. Magnesium 1.1 mg/dL
D. Calcium 9.0 mg/dL
Correct Answer: C. Magnesium 1.1 mg/dL
Rationale: Hypomagnesemia is a potential adverse effect of prolonged PPI use.
7. A patient on lansoprazole reports new-onset muscle cramps and palpitations. What is
the nurse’s priority action?
A. Check blood pressure
B. Notify the provider and assess electrolytes
C. Hold the next dose
D. Instruct the patient to increase water intake
Correct Answer: B. Notify the provider and assess electrolytes
Rationale: These symptoms may indicate electrolyte disturbances (e.g.,
hypomagnesemia), which need immediate evaluation.
8. Which condition is a contraindication for the long-term use of PPIs without appropriate
monitoring?
A. Gastritis
NCLEX RN Exam Bank: GI Pharmacotherapy,
PPIs, Laxatives & Electrolyte Replacement
Table of Contents
Subtopic 1: Proton Pump Inhibitors (PPIs) – Mechanisms, Indications & Safe Use .............. 2
Subtopic 2: Laxatives—Types, Indications, and Nursing Considerations ............................ 9
Subtopic 3: Electrolyte Replacement—GI Losses, Routes, and Safety ............................. 17
Subtopic 4: Polypharmacy & Drug Interactions in GI Pharmacotherapy ........................... 25
Subtopic 5: GI Electrolyte Imbalances—Identification, Correction, and Monitoring.......... 34
Subtopic 6: Bowel Regimens in Postoperative and Elderly Patients ................................. 42
, 2
Subtopic 1: Proton Pump Inhibitors (PPIs) – Mechanisms,
Indications & Safe Use
(Questions 1–20)
1. A patient with GERD is prescribed omeprazole. What is the primary mechanism of action
of omeprazole?
A. Inhibits hydrogen-potassium ATPase in gastric parietal cells
B. Neutralizes stomach acid by forming a base
C. Blocks histamine-2 receptors in the stomach lining
D. Increases mucus secretion in the stomach
Correct Answer: A. Inhibits hydrogen-potassium ATPase in gastric parietal cells
Rationale: Omeprazole is a PPI that suppresses gastric acid secretion by irreversibly
inhibiting the H+/K+ ATPase enzyme system in the parietal cells.
2. Which of the following is a common long-term risk associated with chronic PPI use?
A. Iron overload
B. Vitamin B12 deficiency
C. Hypoglycemia
D. Hyperkalemia
Correct Answer: B. Vitamin B12 deficiency
Rationale: Chronic suppression of stomach acid may impair vitamin B12 absorption,
increasing the risk of deficiency.
3. A nurse is reviewing discharge instructions for a patient taking pantoprazole. Which
statement requires further education?
, 3
A. "I will take this medication before breakfast."
B. "I can crush the tablet if I have trouble swallowing."
C. "This medication reduces stomach acid production."
D. "I should notify my provider if I develop diarrhea."
Correct Answer: B. "I can crush the tablet if I have trouble swallowing."
Rationale: PPIs like pantoprazole are enteric-coated and should not be crushed, as this
alters the drug's effectiveness.
4. For a patient taking omeprazole, which condition should be monitored due to increased
risk?
A. Peptic ulcer
B. Clostridioides difficile infection
C. Hypertension
D. Asthma
Correct Answer: B. Clostridioides difficile infection
Rationale: PPI use can alter gut flora and increase susceptibility to infections like C.
difficile.
5. Esomeprazole is most effective when taken:
A. At bedtime
B. With food
C. 30–60 minutes before meals
D. After experiencing reflux
Correct Answer: C. 30–60 minutes before meals
, 4
Rationale: PPIs are best absorbed and most effective when taken before meals, allowing
suppression of acid before food triggers secretion.
6. Which of the following lab results would be most concerning for a patient on long-term
PPI therapy?
A. Sodium 139 mEq/L
B. Glucose 92 mg/dL
C. Magnesium 1.1 mg/dL
D. Calcium 9.0 mg/dL
Correct Answer: C. Magnesium 1.1 mg/dL
Rationale: Hypomagnesemia is a potential adverse effect of prolonged PPI use.
7. A patient on lansoprazole reports new-onset muscle cramps and palpitations. What is
the nurse’s priority action?
A. Check blood pressure
B. Notify the provider and assess electrolytes
C. Hold the next dose
D. Instruct the patient to increase water intake
Correct Answer: B. Notify the provider and assess electrolytes
Rationale: These symptoms may indicate electrolyte disturbances (e.g.,
hypomagnesemia), which need immediate evaluation.
8. Which condition is a contraindication for the long-term use of PPIs without appropriate
monitoring?
A. Gastritis
