PHARMACOLOGY HESI
Exam Test Bank 2026/2027
Comprehensive Question Set with Verified Answers
Official Practice Exam -- 2026/2027 Edition
Questions Minutes Passing Score Sections
100 120 80% 6
TABLE OF CONTENTS
General Pharmacology Principles . . . Questions 1--17 (17)
Cardiovascular Drugs . . . Questions 18--34 (17)
Central Nervous System Drugs . . . Questions 35--51 (17)
Anti-Infective & Antineoplastic Drugs . . . Questions 52--68 (17)
Endocrine & Respiratory Drugs . . . Questions 69--84 (16)
INSTRUCTIONS Gastrointestinal & Nutritional Drugs . . . Questions 85--100 (16)
Read each question carefully. Select the single best answer from the four options provided. Each question presents a realistic
clinical scenario. The correct answer and rationale follow each question. You have 120 minutes to complete all 100 questions.
A score of 80% or higher (80/100) is required to pass.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 1 of ??
,SECTION 1: GENERAL PHARMACOLOGY PRINCIPLES -- Questions 1--17
Q1. Question 1 of 100
Q1. A 68-year-old patient is prescribed a drug with a narrow therapeutic index. The nurse
understands that this means the drug has which characteristic?
A safe dosage range that is very wide
A dose-response curve that is shifted far to the right
A small margin between the therapeutic dose and the toxic dose
A high first-pass effect that reduces bioavailability
Correct Answer: C
Rationale:
Drugs with a narrow therapeutic index have a small margin between the therapeutic and toxic doses, requiring
careful monitoring. A wide safe dosage range describes drugs with a wide therapeutic index, which is the
opposite of this situation.
Q2. Question 2 of 100
Q2. A patient asks why the oral dose of a medication is higher than the intravenous dose. The nurse
explains that this difference is primarily due to which pharmacokinetic process?
Distribution to target tissues
Plasma protein binding
Renal excretion of active drug
First-pass hepatic metabolism
Correct Answer: D
Rationale:
First-pass metabolism in the liver reduces the amount of active drug reaching systemic circulation after oral
administration, necessitating a higher oral dose. Distribution and protein binding affect drug levels but do not
explain the dose difference between routes.
Q3. Question 3 of 100
Q3. A 55-year-old woman is taking multiple medications including a CYP3A4 inhibitor. The nurse
should monitor for which expected effect on a substrate drug metabolized by CYP3A4?
Decreased substrate drug levels
Increased substrate drug excretion
Increased substrate drug levels
No change in substrate drug metabolism
Correct Answer: C
Rationale:
CYP3A4 inhibitors reduce the metabolism of substrate drugs, leading to increased substrate drug levels and
potential toxicity. Decreased levels would occur with an inducer, not an inhibitor.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 2 of ??
,Q4. Question 4 of 100
Q4. The nurse administers a medication at 0800. Blood levels drawn at 1200 show a concentration of
20 mcg/mL. By 2000, the level is 5 mcg/mL. What is the approximate half-life of this drug?
2 hours
8 hours
6 hours
4 hours
Correct Answer: D
Rationale:
The drug concentration dropped from 20 to 5 mcg/mL over 8 hours, representing two half-lives (20 to 10 to 5).
Therefore, one half-life is approximately 4 hours. A 2-hour half-life would result in a much lower level by 2000.
Q5. Question 5 of 100
Q5. A patient receiving a medication that is highly protein-bound begins taking another highly
protein-bound drug. The nurse anticipates which effect?
Decreased free drug levels of both medications
Increased excretion of both medications
Increased free drug levels of one or both medications
No significant change in drug levels
Correct Answer: C
Rationale:
When two highly protein-bound drugs are given together, they compete for binding sites, displacing one or both
drugs and increasing free (active) drug levels. This displacement increases the risk of toxicity rather than
decreasing free levels.
Q6. Question 6 of 100
Q6. A student nurse asks why a patient with liver disease requires dosage adjustments for many
medications. The best explanation is that liver disease impairs which process?
First-pass metabolism and overall hepatic clearance
Glomerular filtration rate
Gastric acid secretion
P-glycoprotein transport in the intestines
Correct Answer: A
Rationale:
Liver disease impairs first-pass metabolism and overall hepatic clearance, reducing drug metabolism and
leading to drug accumulation. Glomerular filtration is a renal function, and P-glycoprotein transport is intestinal.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 3 of ??
, Q7. Question 7 of 100
Q7. A nurse is preparing to administer a loading dose of a medication. The primary purpose of a
loading dose is to rapidly achieve which pharmacokinetic parameter?
Steady-state concentration
Trough concentration before the next dose
Peak concentration after distribution
Minimum effective concentration
Correct Answer: D
Rationale:
A loading dose is given to rapidly achieve the minimum effective concentration (therapeutic level) before steady
state would normally be reached through maintenance dosing alone. Steady state takes 4-5 half-lives to achieve
with maintenance doses only.
Q8. Question 8 of 100
Q8. A patient reports taking St. John's wort daily. The nurse is aware that this herbal supplement acts
as a cytochrome P450 inducer and may cause which effect with concurrently prescribed
medications?
Increased drug effects and higher drug levels
No change because herbal products are not potent enough to interact
Delayed onset but increased peak drug levels
Decreased drug effects and lower drug levels
Correct Answer: D
Rationale:
St. John's wort induces CYP450 enzymes, increasing the metabolism of many drugs and resulting in decreased
drug effects and lower drug levels. This is the opposite of enzyme inhibition, which would increase drug levels.
Q9. Question 9 of 100
Q9. A nurse explains to a patient that a drug's onset of action refers to which time period?
The time it takes for the drug to reach steady state
The time it takes for the drug to be completely eliminated
The time it takes for the drug to reach its peak concentration
The time it takes for the drug to produce its first observable effect
Correct Answer: D
Rationale:
Onset of action is the time between drug administration and the first observable therapeutic effect. Steady state
requires multiple doses over time, and peak concentration refers to the maximum level reached, not the first
effect.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 4 of ??
Exam Test Bank 2026/2027
Comprehensive Question Set with Verified Answers
Official Practice Exam -- 2026/2027 Edition
Questions Minutes Passing Score Sections
100 120 80% 6
TABLE OF CONTENTS
General Pharmacology Principles . . . Questions 1--17 (17)
Cardiovascular Drugs . . . Questions 18--34 (17)
Central Nervous System Drugs . . . Questions 35--51 (17)
Anti-Infective & Antineoplastic Drugs . . . Questions 52--68 (17)
Endocrine & Respiratory Drugs . . . Questions 69--84 (16)
INSTRUCTIONS Gastrointestinal & Nutritional Drugs . . . Questions 85--100 (16)
Read each question carefully. Select the single best answer from the four options provided. Each question presents a realistic
clinical scenario. The correct answer and rationale follow each question. You have 120 minutes to complete all 100 questions.
A score of 80% or higher (80/100) is required to pass.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 1 of ??
,SECTION 1: GENERAL PHARMACOLOGY PRINCIPLES -- Questions 1--17
Q1. Question 1 of 100
Q1. A 68-year-old patient is prescribed a drug with a narrow therapeutic index. The nurse
understands that this means the drug has which characteristic?
A safe dosage range that is very wide
A dose-response curve that is shifted far to the right
A small margin between the therapeutic dose and the toxic dose
A high first-pass effect that reduces bioavailability
Correct Answer: C
Rationale:
Drugs with a narrow therapeutic index have a small margin between the therapeutic and toxic doses, requiring
careful monitoring. A wide safe dosage range describes drugs with a wide therapeutic index, which is the
opposite of this situation.
Q2. Question 2 of 100
Q2. A patient asks why the oral dose of a medication is higher than the intravenous dose. The nurse
explains that this difference is primarily due to which pharmacokinetic process?
Distribution to target tissues
Plasma protein binding
Renal excretion of active drug
First-pass hepatic metabolism
Correct Answer: D
Rationale:
First-pass metabolism in the liver reduces the amount of active drug reaching systemic circulation after oral
administration, necessitating a higher oral dose. Distribution and protein binding affect drug levels but do not
explain the dose difference between routes.
Q3. Question 3 of 100
Q3. A 55-year-old woman is taking multiple medications including a CYP3A4 inhibitor. The nurse
should monitor for which expected effect on a substrate drug metabolized by CYP3A4?
Decreased substrate drug levels
Increased substrate drug excretion
Increased substrate drug levels
No change in substrate drug metabolism
Correct Answer: C
Rationale:
CYP3A4 inhibitors reduce the metabolism of substrate drugs, leading to increased substrate drug levels and
potential toxicity. Decreased levels would occur with an inducer, not an inhibitor.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 2 of ??
,Q4. Question 4 of 100
Q4. The nurse administers a medication at 0800. Blood levels drawn at 1200 show a concentration of
20 mcg/mL. By 2000, the level is 5 mcg/mL. What is the approximate half-life of this drug?
2 hours
8 hours
6 hours
4 hours
Correct Answer: D
Rationale:
The drug concentration dropped from 20 to 5 mcg/mL over 8 hours, representing two half-lives (20 to 10 to 5).
Therefore, one half-life is approximately 4 hours. A 2-hour half-life would result in a much lower level by 2000.
Q5. Question 5 of 100
Q5. A patient receiving a medication that is highly protein-bound begins taking another highly
protein-bound drug. The nurse anticipates which effect?
Decreased free drug levels of both medications
Increased excretion of both medications
Increased free drug levels of one or both medications
No significant change in drug levels
Correct Answer: C
Rationale:
When two highly protein-bound drugs are given together, they compete for binding sites, displacing one or both
drugs and increasing free (active) drug levels. This displacement increases the risk of toxicity rather than
decreasing free levels.
Q6. Question 6 of 100
Q6. A student nurse asks why a patient with liver disease requires dosage adjustments for many
medications. The best explanation is that liver disease impairs which process?
First-pass metabolism and overall hepatic clearance
Glomerular filtration rate
Gastric acid secretion
P-glycoprotein transport in the intestines
Correct Answer: A
Rationale:
Liver disease impairs first-pass metabolism and overall hepatic clearance, reducing drug metabolism and
leading to drug accumulation. Glomerular filtration is a renal function, and P-glycoprotein transport is intestinal.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 3 of ??
, Q7. Question 7 of 100
Q7. A nurse is preparing to administer a loading dose of a medication. The primary purpose of a
loading dose is to rapidly achieve which pharmacokinetic parameter?
Steady-state concentration
Trough concentration before the next dose
Peak concentration after distribution
Minimum effective concentration
Correct Answer: D
Rationale:
A loading dose is given to rapidly achieve the minimum effective concentration (therapeutic level) before steady
state would normally be reached through maintenance dosing alone. Steady state takes 4-5 half-lives to achieve
with maintenance doses only.
Q8. Question 8 of 100
Q8. A patient reports taking St. John's wort daily. The nurse is aware that this herbal supplement acts
as a cytochrome P450 inducer and may cause which effect with concurrently prescribed
medications?
Increased drug effects and higher drug levels
No change because herbal products are not potent enough to interact
Delayed onset but increased peak drug levels
Decreased drug effects and lower drug levels
Correct Answer: D
Rationale:
St. John's wort induces CYP450 enzymes, increasing the metabolism of many drugs and resulting in decreased
drug effects and lower drug levels. This is the opposite of enzyme inhibition, which would increase drug levels.
Q9. Question 9 of 100
Q9. A nurse explains to a patient that a drug's onset of action refers to which time period?
The time it takes for the drug to reach steady state
The time it takes for the drug to be completely eliminated
The time it takes for the drug to reach its peak concentration
The time it takes for the drug to produce its first observable effect
Correct Answer: D
Rationale:
Onset of action is the time between drug administration and the first observable therapeutic effect. Steady state
requires multiple doses over time, and peak concentration refers to the maximum level reached, not the first
effect.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 4 of ??
