HESI Pharmacology Exam 2025/2026 – Actual
Verified Questions and Rationalized Answers | 100%
Guaranteed Pass | Latest High-Yield Version
Instructions
The following are 80 multiple-choice questions designed for the HESI Pharmacology Exam
2025/2026. Each question includes four answer options, with one correct answer and a
detailed rationale based on current pharmacology principles. Select the best answer for
each question.
Question 1: A patient with type 2 diabetes is prescribed metformin. What is the pri-
mary mechanism of action of this medication?
A. Stimulates insulin release from pancreatic beta cells
B. Increases insulin sensitivity in peripheral tissues
C. Inhibits glucose absorption in the intestines
D. Enhances glucagon secretion
Correct Answer: B. Increases insulin sensitivity in peripheral tissues
Rationale: Metformin primarily reduces hepatic glucose production and
enhances insulin sensitivity in peripheral tissues, such as muscle and fat,
improving glucose uptake. It does not stimulate insulin release, inhibit
glucose absorption, or enhance glucagon secretion.
Question 2: A nurse administers lisinopril to a patient with hypertension. Which ad-
verse effect should the nurse monitor for?
A. Hyperkalemia
B. Hypoglycemia
C. Hypokalemia
D. Hypernatremia
Correct Answer: A. Hyperkalemia
Rationale: Lisinopril, an ACE inhibitor, can cause hyperkalemia by re-
ducing aldosterone secretion, which decreases potassium excretion in the
kidneys. Hypoglycemia and hypokalemia are not typically associated with
ACE inhibitors, and hypernatremia is less common.
Question 3: A patient is prescribed warfarin for atrial fibrillation. Which laboratory
value should the nurse monitor?
A. Platelet count
B. International Normalized Ratio (INR)
C. Activated partial thromboplastin time (aPTT)
D. Hemoglobin A1c
Correct Answer: B. International Normalized Ratio (INR)
Rationale: Warfarin’s anticoagulant effect is monitored using INR, which
assesses the extrinsic coagulation pathway. INR is critical for ensuring
therapeutic anticoagulation and preventing bleeding or clotting risks. Platelet
count, aPTT, and hemoglobin A1c are not primarily used for warfarin mon-
itoring.
Question 4: A patient with asthma is prescribed albuterol. What is the primary ther-
1
, apeutic effect of this medication?
A. Reduces airway inflammation
B. Dilates bronchial smooth muscle
C. Suppresses histamine release
D. Inhibits leukotriene synthesis
Correct Answer: B. Dilates bronchial smooth muscle
Rationale: Albuterol, a short-acting beta-2 agonist, causes bronchodila-
tion by relaxing bronchial smooth muscle, relieving acute asthma symp-
toms. It does not reduce inflammation, suppress histamine, or inhibit
leukotrienes.
Question 5: A nurse is preparing to administer digoxin to a patient with heart failure.
Which electrolyte imbalance increases the risk of digoxin toxicity?
A. Hyperkalemia
B. Hypokalemia
C. Hypercalcemia
D. Hyponatremia
Correct Answer: B. Hypokalemia
Rationale: Hypokalemia enhances digoxin’s binding to cardiac cells, in-
creasing the risk of toxicity. Hyperkalemia, hypercalcemia, and hypona-
tremia are less directly associated with digoxin toxicity.
Question 6: Which medication is contraindicated in a patient with a history of anaphy-
laxis to penicillin?
A. Azithromycin
B. Amoxicillin
C. Doxycycline
D. Levofloxacin
Correct Answer: B. Amoxicillin
Rationale: Amoxicillin is a penicillin derivative and is contraindicated
in patients with a history of penicillin allergy due to the risk of cross-
reactivity. Azithromycin, doxycycline, and levofloxacin are not penicillins
and are generally safe in this context.
Question 7: A patient with chronic kidney disease is prescribed epoetin alfa. What is
the primary indication for this medication?
A. Hypertension
B. Anemia
C. Hyperkalemia
D. Proteinuria
Correct Answer: B. Anemia
Rationale: Epoetin alfa stimulates red blood cell production and is used
to treat anemia associated with chronic kidney disease. It does not directly
treat hypertension, hyperkalemia, or proteinuria.
Question 8: A nurse is educating a patient about atorvastatin. Which dietary instruc-
tion is most appropriate?
A. Avoid grapefruit juice
B. Increase dietary fiber
C. Limit calcium-rich foods
2
, D. Avoid high-protein diets
Correct Answer: A. Avoid grapefruit juice
Rationale: Grapefruit juice inhibits CYP3A4, increasing atorvastatin lev-
els and the risk of toxicity. Fiber, calcium, and protein do not significantly
interact with statins.
Question 9: A patient is receiving furosemide for edema. Which assessment is most
critical before administration?
A. Blood glucose levels
B. Serum potassium levels
C. Liver function tests
D. Thyroid function tests
Correct Answer: B. Serum potassium levels
Rationale: Furosemide, a loop diuretic, can cause hypokalemia, which
may lead to arrhythmias. Monitoring potassium levels is critical. Blood
glucose, liver, and thyroid function are less directly affected.
Question 10: A patient with depression is prescribed fluoxetine. How long does it typi-
cally take for therapeutic effects to be noticeable?
A. 1–2 days
B. 1–2 weeks
C. 3–4 weeks
D. 6–8 weeks
Correct Answer: C. 3–4 weeks
Rationale: Fluoxetine, an SSRI, typically requires 3–4 weeks to achieve
therapeutic effects due to the time needed for serotonin levels to stabilize.
Immediate effects are not expected.
Question 11: A patient with epilepsy is prescribed phenytoin. Which adverse effect
should the nurse monitor for?
A. Gingival hyperplasia
B. Hypoglycemia
C. Hypernatremia
D. Bronchospasm
Correct Answer: A. Gingival hyperplasia
Rationale: Phenytoin is commonly associated with gingival hyperplasia,
especially with long-term use. Hypoglycemia, hypernatremia, and bron-
chospasm are not typical adverse effects.
Question 12: A patient is prescribed heparin for deep vein thrombosis. Which antidote
should be readily available?
A. Vitamin K
B. Protamine sulfate
C. Flumazenil
D. Naloxone
Correct Answer: B. Protamine sulfate
Rationale: Protamine sulfate reverses heparin’s anticoagulant effects. Vi-
tamin K is used for warfarin, flumazenil for benzodiazepines, and naloxone
for opioids.
3
Verified Questions and Rationalized Answers | 100%
Guaranteed Pass | Latest High-Yield Version
Instructions
The following are 80 multiple-choice questions designed for the HESI Pharmacology Exam
2025/2026. Each question includes four answer options, with one correct answer and a
detailed rationale based on current pharmacology principles. Select the best answer for
each question.
Question 1: A patient with type 2 diabetes is prescribed metformin. What is the pri-
mary mechanism of action of this medication?
A. Stimulates insulin release from pancreatic beta cells
B. Increases insulin sensitivity in peripheral tissues
C. Inhibits glucose absorption in the intestines
D. Enhances glucagon secretion
Correct Answer: B. Increases insulin sensitivity in peripheral tissues
Rationale: Metformin primarily reduces hepatic glucose production and
enhances insulin sensitivity in peripheral tissues, such as muscle and fat,
improving glucose uptake. It does not stimulate insulin release, inhibit
glucose absorption, or enhance glucagon secretion.
Question 2: A nurse administers lisinopril to a patient with hypertension. Which ad-
verse effect should the nurse monitor for?
A. Hyperkalemia
B. Hypoglycemia
C. Hypokalemia
D. Hypernatremia
Correct Answer: A. Hyperkalemia
Rationale: Lisinopril, an ACE inhibitor, can cause hyperkalemia by re-
ducing aldosterone secretion, which decreases potassium excretion in the
kidneys. Hypoglycemia and hypokalemia are not typically associated with
ACE inhibitors, and hypernatremia is less common.
Question 3: A patient is prescribed warfarin for atrial fibrillation. Which laboratory
value should the nurse monitor?
A. Platelet count
B. International Normalized Ratio (INR)
C. Activated partial thromboplastin time (aPTT)
D. Hemoglobin A1c
Correct Answer: B. International Normalized Ratio (INR)
Rationale: Warfarin’s anticoagulant effect is monitored using INR, which
assesses the extrinsic coagulation pathway. INR is critical for ensuring
therapeutic anticoagulation and preventing bleeding or clotting risks. Platelet
count, aPTT, and hemoglobin A1c are not primarily used for warfarin mon-
itoring.
Question 4: A patient with asthma is prescribed albuterol. What is the primary ther-
1
, apeutic effect of this medication?
A. Reduces airway inflammation
B. Dilates bronchial smooth muscle
C. Suppresses histamine release
D. Inhibits leukotriene synthesis
Correct Answer: B. Dilates bronchial smooth muscle
Rationale: Albuterol, a short-acting beta-2 agonist, causes bronchodila-
tion by relaxing bronchial smooth muscle, relieving acute asthma symp-
toms. It does not reduce inflammation, suppress histamine, or inhibit
leukotrienes.
Question 5: A nurse is preparing to administer digoxin to a patient with heart failure.
Which electrolyte imbalance increases the risk of digoxin toxicity?
A. Hyperkalemia
B. Hypokalemia
C. Hypercalcemia
D. Hyponatremia
Correct Answer: B. Hypokalemia
Rationale: Hypokalemia enhances digoxin’s binding to cardiac cells, in-
creasing the risk of toxicity. Hyperkalemia, hypercalcemia, and hypona-
tremia are less directly associated with digoxin toxicity.
Question 6: Which medication is contraindicated in a patient with a history of anaphy-
laxis to penicillin?
A. Azithromycin
B. Amoxicillin
C. Doxycycline
D. Levofloxacin
Correct Answer: B. Amoxicillin
Rationale: Amoxicillin is a penicillin derivative and is contraindicated
in patients with a history of penicillin allergy due to the risk of cross-
reactivity. Azithromycin, doxycycline, and levofloxacin are not penicillins
and are generally safe in this context.
Question 7: A patient with chronic kidney disease is prescribed epoetin alfa. What is
the primary indication for this medication?
A. Hypertension
B. Anemia
C. Hyperkalemia
D. Proteinuria
Correct Answer: B. Anemia
Rationale: Epoetin alfa stimulates red blood cell production and is used
to treat anemia associated with chronic kidney disease. It does not directly
treat hypertension, hyperkalemia, or proteinuria.
Question 8: A nurse is educating a patient about atorvastatin. Which dietary instruc-
tion is most appropriate?
A. Avoid grapefruit juice
B. Increase dietary fiber
C. Limit calcium-rich foods
2
, D. Avoid high-protein diets
Correct Answer: A. Avoid grapefruit juice
Rationale: Grapefruit juice inhibits CYP3A4, increasing atorvastatin lev-
els and the risk of toxicity. Fiber, calcium, and protein do not significantly
interact with statins.
Question 9: A patient is receiving furosemide for edema. Which assessment is most
critical before administration?
A. Blood glucose levels
B. Serum potassium levels
C. Liver function tests
D. Thyroid function tests
Correct Answer: B. Serum potassium levels
Rationale: Furosemide, a loop diuretic, can cause hypokalemia, which
may lead to arrhythmias. Monitoring potassium levels is critical. Blood
glucose, liver, and thyroid function are less directly affected.
Question 10: A patient with depression is prescribed fluoxetine. How long does it typi-
cally take for therapeutic effects to be noticeable?
A. 1–2 days
B. 1–2 weeks
C. 3–4 weeks
D. 6–8 weeks
Correct Answer: C. 3–4 weeks
Rationale: Fluoxetine, an SSRI, typically requires 3–4 weeks to achieve
therapeutic effects due to the time needed for serotonin levels to stabilize.
Immediate effects are not expected.
Question 11: A patient with epilepsy is prescribed phenytoin. Which adverse effect
should the nurse monitor for?
A. Gingival hyperplasia
B. Hypoglycemia
C. Hypernatremia
D. Bronchospasm
Correct Answer: A. Gingival hyperplasia
Rationale: Phenytoin is commonly associated with gingival hyperplasia,
especially with long-term use. Hypoglycemia, hypernatremia, and bron-
chospasm are not typical adverse effects.
Question 12: A patient is prescribed heparin for deep vein thrombosis. Which antidote
should be readily available?
A. Vitamin K
B. Protamine sulfate
C. Flumazenil
D. Naloxone
Correct Answer: B. Protamine sulfate
Rationale: Protamine sulfate reverses heparin’s anticoagulant effects. Vi-
tamin K is used for warfarin, flumazenil for benzodiazepines, and naloxone
for opioids.
3
