HESI Pharmacology Review Exam Prep – Real Practice Questions, Answers &
Detailed Rationales (Updated 2026) | Drug Classes & Mechanisms of
Action, Pharmacokinetics & Pharmacodynamics, Medication Administration &
Dosage Calculations, Side Effects & Adverse Reactions, IV Therapy & Medication
Safety, High-Alert Medications, Patient Education & NCLEX-Style Pharmacology
Review
Question 1: Which class of medications is primarily used to treat hypertension by
blocking the conversion of angiotensin I to angiotensin II?
A. Beta-blockers
B. Calcium channel blockers
C. Diuretics
D. Angiotensin-converting enzyme (ACE) inhibitors
CORRECT ANSWER: D. Angiotensin-converting enzyme (ACE) inhibitors
Rationale: ACE inhibitors, such as lisinopril and enalapril, work by inhibiting the
angiotensin-converting enzyme, thereby preventing the formation of angiotensin II—a
potent vasoconstrictor. This results in vasodilation and reduced blood pressure.
Question 2: A patient prescribed warfarin should avoid excessive intake of which
vitamin due to its role in clotting factor synthesis?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin K
CORRECT ANSWER: D. Vitamin K
Rationale: Vitamin K is essential for the hepatic synthesis of clotting factors II, VII, IX,
and X. Warfarin exerts its anticoagulant effect by antagonizing vitamin K; thus,
fluctuations in vitamin K intake can significantly alter warfarin’s efficacy and increase
bleeding or clotting risks.
Question 3: Which adverse effect is most commonly associated with long-term use
of corticosteroids?
A. Hypoglycemia
B. Hyperkalemia
C. Osteoporosis
D. Bradycardia
CORRECT ANSWER: C. Osteoporosis
Rationale: Chronic corticosteroid use suppresses osteoblast activity and calcium
absorption, leading to decreased bone density and increased fracture risk—hence
osteoporosis is a well-documented adverse effect requiring monitoring and prophylaxis.
Question 4: What is the primary mechanism of action of metformin in the
treatment of type 2 diabetes mellitus?
,A. Stimulating insulin release from pancreatic beta cells
B. Increasing peripheral insulin sensitivity and decreasing hepatic glucose production
C. Inhibiting intestinal absorption of carbohydrates
D. Enhancing renal excretion of glucose
CORRECT ANSWER: B. Increasing peripheral insulin sensitivity and decreasing
hepatic glucose production
Rationale: Metformin primarily reduces hepatic gluconeogenesis and improves insulin
sensitivity in skeletal muscle and adipose tissue without stimulating insulin secretion,
making it ideal for patients with insulin resistance.
Question 5: Which medication is considered first-line for acute relief of
bronchospasm in asthma?
A. Fluticasone
B. Montelukast
C. Albuterol
D. Theophylline
CORRECT ANSWER: C. Albuterol
Rationale: Albuterol is a short-acting beta2-adrenergic agonist that causes rapid
bronchodilation by relaxing bronchial smooth muscle, making it the preferred rescue
medication during acute asthma exacerbations.
Question 6: Which laboratory value must be monitored regularly in patients
receiving heparin therapy?
A. Hemoglobin
B. Platelet count
C. Activated partial thromboplastin time (aPTT)
D. Serum creatinine
CORRECT ANSWER: C. Activated partial thromboplastin time (aPTT)
Rationale: Heparin’s anticoagulant effect is monitored using aPTT, which reflects the
intrinsic coagulation pathway. Therapeutic ranges typically are 1.5 to 2.5 times the
control value to ensure effective anticoagulation without excessive bleeding risk.
Question 7: A patient taking digoxin reports nausea, visual disturbances, and
fatigue. Which condition should the nurse suspect?
A. Hypokalemia
B. Digoxin toxicity
C. Myocardial infarction
D. Heart failure exacerbation
CORRECT ANSWER: B. Digoxin toxicity
, Rationale: Nausea, fatigue, and visual changes (e.g., yellow-green halos) are classic
signs of digoxin toxicity. Serum digoxin levels and electrolytes (especially potassium)
should be assessed immediately, as hypokalemia increases toxicity risk.
Question 8: Which drug class is contraindicated in patients with a history of sulfa
allergy?
A. Penicillins
B. Cephalosporins
C. Sulfonamide antibiotics
D. Macrolides
CORRECT ANSWER: C. Sulfonamide antibiotics
Rationale: Sulfonamide antibiotics (e.g., sulfamethoxazole) contain a sulfonamide
moiety and can trigger allergic reactions—including Stevens-Johnson syndrome—in
individuals with known sulfa allergies, warranting avoidance.
Question 9: What is the antidote for benzodiazepine overdose?
A. Naloxone
B. Flumazenil
C. Atropine
D. Protamine sulfate
CORRECT ANSWER: B. Flumazenil
Rationale: Flumazenil is a competitive benzodiazepine receptor antagonist used to
reverse sedation or respiratory depression caused by benzodiazepine overdose, though
caution is needed in patients with seizure disorders or chronic benzodiazepine use.
Question 10: Which side effect is most commonly associated with opioid
analgesics?
A. Diarrhea
B. Hypertension
C. Constipation
D. Tachycardia
CORRECT ANSWER: C. Constipation
Rationale: Opioids decrease gastrointestinal motility by acting on mu-opioid receptors
in the gut, leading to constipation—a nearly universal side effect that often requires
prophylactic laxatives in patients on chronic therapy.
Question 11: Which medication requires regular monitoring of serum levels to
ensure therapeutic efficacy and prevent toxicity?
A. Lisinopril
B. Metoprolol
Detailed Rationales (Updated 2026) | Drug Classes & Mechanisms of
Action, Pharmacokinetics & Pharmacodynamics, Medication Administration &
Dosage Calculations, Side Effects & Adverse Reactions, IV Therapy & Medication
Safety, High-Alert Medications, Patient Education & NCLEX-Style Pharmacology
Review
Question 1: Which class of medications is primarily used to treat hypertension by
blocking the conversion of angiotensin I to angiotensin II?
A. Beta-blockers
B. Calcium channel blockers
C. Diuretics
D. Angiotensin-converting enzyme (ACE) inhibitors
CORRECT ANSWER: D. Angiotensin-converting enzyme (ACE) inhibitors
Rationale: ACE inhibitors, such as lisinopril and enalapril, work by inhibiting the
angiotensin-converting enzyme, thereby preventing the formation of angiotensin II—a
potent vasoconstrictor. This results in vasodilation and reduced blood pressure.
Question 2: A patient prescribed warfarin should avoid excessive intake of which
vitamin due to its role in clotting factor synthesis?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin K
CORRECT ANSWER: D. Vitamin K
Rationale: Vitamin K is essential for the hepatic synthesis of clotting factors II, VII, IX,
and X. Warfarin exerts its anticoagulant effect by antagonizing vitamin K; thus,
fluctuations in vitamin K intake can significantly alter warfarin’s efficacy and increase
bleeding or clotting risks.
Question 3: Which adverse effect is most commonly associated with long-term use
of corticosteroids?
A. Hypoglycemia
B. Hyperkalemia
C. Osteoporosis
D. Bradycardia
CORRECT ANSWER: C. Osteoporosis
Rationale: Chronic corticosteroid use suppresses osteoblast activity and calcium
absorption, leading to decreased bone density and increased fracture risk—hence
osteoporosis is a well-documented adverse effect requiring monitoring and prophylaxis.
Question 4: What is the primary mechanism of action of metformin in the
treatment of type 2 diabetes mellitus?
,A. Stimulating insulin release from pancreatic beta cells
B. Increasing peripheral insulin sensitivity and decreasing hepatic glucose production
C. Inhibiting intestinal absorption of carbohydrates
D. Enhancing renal excretion of glucose
CORRECT ANSWER: B. Increasing peripheral insulin sensitivity and decreasing
hepatic glucose production
Rationale: Metformin primarily reduces hepatic gluconeogenesis and improves insulin
sensitivity in skeletal muscle and adipose tissue without stimulating insulin secretion,
making it ideal for patients with insulin resistance.
Question 5: Which medication is considered first-line for acute relief of
bronchospasm in asthma?
A. Fluticasone
B. Montelukast
C. Albuterol
D. Theophylline
CORRECT ANSWER: C. Albuterol
Rationale: Albuterol is a short-acting beta2-adrenergic agonist that causes rapid
bronchodilation by relaxing bronchial smooth muscle, making it the preferred rescue
medication during acute asthma exacerbations.
Question 6: Which laboratory value must be monitored regularly in patients
receiving heparin therapy?
A. Hemoglobin
B. Platelet count
C. Activated partial thromboplastin time (aPTT)
D. Serum creatinine
CORRECT ANSWER: C. Activated partial thromboplastin time (aPTT)
Rationale: Heparin’s anticoagulant effect is monitored using aPTT, which reflects the
intrinsic coagulation pathway. Therapeutic ranges typically are 1.5 to 2.5 times the
control value to ensure effective anticoagulation without excessive bleeding risk.
Question 7: A patient taking digoxin reports nausea, visual disturbances, and
fatigue. Which condition should the nurse suspect?
A. Hypokalemia
B. Digoxin toxicity
C. Myocardial infarction
D. Heart failure exacerbation
CORRECT ANSWER: B. Digoxin toxicity
, Rationale: Nausea, fatigue, and visual changes (e.g., yellow-green halos) are classic
signs of digoxin toxicity. Serum digoxin levels and electrolytes (especially potassium)
should be assessed immediately, as hypokalemia increases toxicity risk.
Question 8: Which drug class is contraindicated in patients with a history of sulfa
allergy?
A. Penicillins
B. Cephalosporins
C. Sulfonamide antibiotics
D. Macrolides
CORRECT ANSWER: C. Sulfonamide antibiotics
Rationale: Sulfonamide antibiotics (e.g., sulfamethoxazole) contain a sulfonamide
moiety and can trigger allergic reactions—including Stevens-Johnson syndrome—in
individuals with known sulfa allergies, warranting avoidance.
Question 9: What is the antidote for benzodiazepine overdose?
A. Naloxone
B. Flumazenil
C. Atropine
D. Protamine sulfate
CORRECT ANSWER: B. Flumazenil
Rationale: Flumazenil is a competitive benzodiazepine receptor antagonist used to
reverse sedation or respiratory depression caused by benzodiazepine overdose, though
caution is needed in patients with seizure disorders or chronic benzodiazepine use.
Question 10: Which side effect is most commonly associated with opioid
analgesics?
A. Diarrhea
B. Hypertension
C. Constipation
D. Tachycardia
CORRECT ANSWER: C. Constipation
Rationale: Opioids decrease gastrointestinal motility by acting on mu-opioid receptors
in the gut, leading to constipation—a nearly universal side effect that often requires
prophylactic laxatives in patients on chronic therapy.
Question 11: Which medication requires regular monitoring of serum levels to
ensure therapeutic efficacy and prevent toxicity?
A. Lisinopril
B. Metoprolol
