PHARMACOLOGY HESI EXAMINATION
Test Bank
Comprehensive Question Set with Verified Answers
Official Practice Exam | 2026/2027 Edition
100 Questions 120 Minutes 80% Passing 6 Sections
TABLE OF CONTENTS
Section 1: General Pharmacology Principles (18 Questions 1-18)
Section 2: Autonomic Nervous System Drugs (17 Questions 19-35)
Section 3: Cardiovascular Drugs (18 Questions 36-53)
Section 4: Central Nervous System Drugs (17 Questions 54-70)
Section 5: Anti-infective & Antineoplastic Drugs (16 Questions 71-86)
Section 6: Endocrine, Respiratory & GI Drugs (14 Questions 87-100)
INSTRUCTIONS
Read each question carefully. Select the single best answer from the four options provided. A clinical scenario introduces
each question with relevant patient data. Review the rationale after answering to reinforce your understanding. You have
120 minutes to complete all 100 questions. A score of 80% or higher (80 correct) is required to pass.
This practice exam is for educational purposes only.
Pharmacology HESI Test Bank | 2026/2027 Edition
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 1
, Section 1: General Pharmacology Principles -- 2026/2027
Questions 1 - 18 | 18 Questions
Q1 Question 1 of 100
A 72-year-old woman is prescribed a new medication that has a narrow therapeutic index. Her physician orders
serum drug levels to be drawn. The nurse explains that the therapeutic index is the ratio between the toxic dose
and the effective dose of a drug. Why is monitoring especially important for this patient?
A. Drugs with narrow therapeutic indices are always administered intravenously and require continuous
infusion pumps
B. Her advanced age reduces hepatic blood flow, increasing the risk of drug accumulation and toxicity without
careful level monitoring
C. The therapeutic index widens with age, meaning she will need a higher dose than younger patients to
achieve efficacy
D. Narrow therapeutic index drugs have no side effects at any dose, making monitoring unnecessary except
in elderly patients
Correct Answer: B
Rationale:
Elderly patients have reduced hepatic and renal clearance, increasing the risk of drug accumulation and toxicity,
especially with narrow therapeutic index drugs like digoxin or warfarin. The therapeutic index does not widen with
age, and narrow therapeutic index drugs certainly have side effects that make monitoring essential.
Q2 Question 2 of 100
A 45-year-old man is taking phenytoin for seizure control and begins taking a new medication that inhibits
cytochrome P450 enzymes. The nurse anticipates that this drug interaction will produce which effect on
phenytoin levels and what clinical consequence?
A. Decreased phenytoin levels leading to loss of seizure control due to enhanced hepatic metabolism
B. Increased phenytoin levels with potential toxicity because the inhibitor reduces phenytoin metabolism
C. No change in phenytoin levels because phenytoin is metabolized exclusively by renal excretion
D. A transient decrease followed by a rebound increase in phenytoin levels due to enzyme induction feedback
Correct Answer: B
Rationale:
CYP450 inhibitors reduce the metabolism of drugs like phenytoin that are substrates of these enzymes, causing
phenytoin levels to rise and increasing the risk of toxicity such as nystagmus, ataxia, and confusion. Phenytoin is
primarily hepatically metabolized, not renally excreted unchanged.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 2
, Q3 Question 3 of 100
A nurse is administering a drug that is a competitive antagonist at the receptor site. The patient has been
receiving an agonist medication for chronic pain. What effect will the competitive antagonist have on the
agonist's action?
A. It will irreversibly bind to the receptor, permanently preventing the agonist from producing any effect
regardless of concentration
B. It will bind to a different receptor site and enhance the agonist effect through positive cooperativity
C. It will increase the agonist's potency without changing its maximum efficacy by stabilizing the receptor
conformation
D. It will reversibly bind to the same receptor site, producing a rightward shift in the dose-response curve that
can be overcome by increasing the agonist dose
Correct Answer: D
Rationale:
A competitive antagonist binds reversibly to the same receptor as the agonist, shifting the dose-response curve to
the right (decreased potency) but not reducing maximum efficacy since higher agonist concentrations can overcome
the blockade. Irreversible antagonists permanently occupy receptors and reduce maximum efficacy.
Q4 Question 4 of 100
A 60-year-old woman with chronic kidney disease has a GFR of 25 mL/min. Her physician adjusts the dose of a
renally eliminated antibiotic. Which pharmacokinetic parameter is most directly affected by her reduced renal
function, necessitating the dose adjustment?
A. Elimination, because reduced GFR decreases renal clearance and prolongs the drug half-life leading to
accumulation
B. Distribution, because decreased GFR reduces plasma protein binding and expands the volume of
distribution
C. Metabolism, because the kidney is the primary organ for phase I oxidative drug metabolism
D. Absorption, because reduced renal function increases gastric acidity and impairs oral drug uptake
Correct Answer: A
Rationale:
Reduced GFR directly impairs renal drug elimination, prolonging half-life and causing drug accumulation unless
doses are adjusted. The kidney performs minimal phase I metabolism, absorption is not primarily affected by GFR,
and while protein binding may change, the primary concern is reduced clearance.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 3
, Q5 Question 5 of 100
A 38-year-old man receives a loading dose of a medication followed by a maintenance dose. The nurse
explains that the loading dose is calculated to achieve a target plasma concentration rapidly. Which factor most
determines the size of the loading dose?
A. The drug's half-life, because longer half-lives require smaller loading doses to reach steady state
B. The drug's clearance rate, because higher clearance requires a proportionally larger loading dose
C. The volume of distribution, because a larger Vd requires a larger loading dose to achieve the desired
plasma concentration
D. The drug's bioavailability, because intravenous drugs always require smaller loading doses than oral
formulations
Correct Answer: C
Rationale:
Loading dose = Target concentration x Volume of distribution / Bioavailability. A drug with a large Vd distributes
widely into tissues, requiring a larger loading dose to achieve the target plasma concentration. Half-life determines
time to steady state, not loading dose size; clearance determines maintenance dose rate.
Q6 Question 6 of 100
A first-year nursing student asks why some drugs require a prescription while others do not. The instructor
explains that the FDA classifies drugs based on safety, abuse potential, and medical use. Under which
schedule would a drug with high abuse potential and no accepted medical use be classified?
A. Schedule II, because these drugs have high abuse potential but accepted medical uses such as opioids
and stimulants
B. Schedule V, because these drugs have the lowest abuse potential among controlled substances
C. Schedule I, because these drugs have high abuse potential and no currently accepted medical use in the
United States
D. Schedule III, because these drugs have moderate abuse potential and include combination products with
limited narcotics
Correct Answer: C
Rationale:
Schedule I drugs (e.g., heroin, LSD) have high abuse potential and no accepted medical use. Schedule II drugs
have high abuse potential but accepted medical uses (e.g., morphine). Schedule III-V drugs have progressively
lower abuse potential. This classification system distinguishes drugs by both abuse risk and therapeutic value.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 4
Test Bank
Comprehensive Question Set with Verified Answers
Official Practice Exam | 2026/2027 Edition
100 Questions 120 Minutes 80% Passing 6 Sections
TABLE OF CONTENTS
Section 1: General Pharmacology Principles (18 Questions 1-18)
Section 2: Autonomic Nervous System Drugs (17 Questions 19-35)
Section 3: Cardiovascular Drugs (18 Questions 36-53)
Section 4: Central Nervous System Drugs (17 Questions 54-70)
Section 5: Anti-infective & Antineoplastic Drugs (16 Questions 71-86)
Section 6: Endocrine, Respiratory & GI Drugs (14 Questions 87-100)
INSTRUCTIONS
Read each question carefully. Select the single best answer from the four options provided. A clinical scenario introduces
each question with relevant patient data. Review the rationale after answering to reinforce your understanding. You have
120 minutes to complete all 100 questions. A score of 80% or higher (80 correct) is required to pass.
This practice exam is for educational purposes only.
Pharmacology HESI Test Bank | 2026/2027 Edition
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 1
, Section 1: General Pharmacology Principles -- 2026/2027
Questions 1 - 18 | 18 Questions
Q1 Question 1 of 100
A 72-year-old woman is prescribed a new medication that has a narrow therapeutic index. Her physician orders
serum drug levels to be drawn. The nurse explains that the therapeutic index is the ratio between the toxic dose
and the effective dose of a drug. Why is monitoring especially important for this patient?
A. Drugs with narrow therapeutic indices are always administered intravenously and require continuous
infusion pumps
B. Her advanced age reduces hepatic blood flow, increasing the risk of drug accumulation and toxicity without
careful level monitoring
C. The therapeutic index widens with age, meaning she will need a higher dose than younger patients to
achieve efficacy
D. Narrow therapeutic index drugs have no side effects at any dose, making monitoring unnecessary except
in elderly patients
Correct Answer: B
Rationale:
Elderly patients have reduced hepatic and renal clearance, increasing the risk of drug accumulation and toxicity,
especially with narrow therapeutic index drugs like digoxin or warfarin. The therapeutic index does not widen with
age, and narrow therapeutic index drugs certainly have side effects that make monitoring essential.
Q2 Question 2 of 100
A 45-year-old man is taking phenytoin for seizure control and begins taking a new medication that inhibits
cytochrome P450 enzymes. The nurse anticipates that this drug interaction will produce which effect on
phenytoin levels and what clinical consequence?
A. Decreased phenytoin levels leading to loss of seizure control due to enhanced hepatic metabolism
B. Increased phenytoin levels with potential toxicity because the inhibitor reduces phenytoin metabolism
C. No change in phenytoin levels because phenytoin is metabolized exclusively by renal excretion
D. A transient decrease followed by a rebound increase in phenytoin levels due to enzyme induction feedback
Correct Answer: B
Rationale:
CYP450 inhibitors reduce the metabolism of drugs like phenytoin that are substrates of these enzymes, causing
phenytoin levels to rise and increasing the risk of toxicity such as nystagmus, ataxia, and confusion. Phenytoin is
primarily hepatically metabolized, not renally excreted unchanged.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 2
, Q3 Question 3 of 100
A nurse is administering a drug that is a competitive antagonist at the receptor site. The patient has been
receiving an agonist medication for chronic pain. What effect will the competitive antagonist have on the
agonist's action?
A. It will irreversibly bind to the receptor, permanently preventing the agonist from producing any effect
regardless of concentration
B. It will bind to a different receptor site and enhance the agonist effect through positive cooperativity
C. It will increase the agonist's potency without changing its maximum efficacy by stabilizing the receptor
conformation
D. It will reversibly bind to the same receptor site, producing a rightward shift in the dose-response curve that
can be overcome by increasing the agonist dose
Correct Answer: D
Rationale:
A competitive antagonist binds reversibly to the same receptor as the agonist, shifting the dose-response curve to
the right (decreased potency) but not reducing maximum efficacy since higher agonist concentrations can overcome
the blockade. Irreversible antagonists permanently occupy receptors and reduce maximum efficacy.
Q4 Question 4 of 100
A 60-year-old woman with chronic kidney disease has a GFR of 25 mL/min. Her physician adjusts the dose of a
renally eliminated antibiotic. Which pharmacokinetic parameter is most directly affected by her reduced renal
function, necessitating the dose adjustment?
A. Elimination, because reduced GFR decreases renal clearance and prolongs the drug half-life leading to
accumulation
B. Distribution, because decreased GFR reduces plasma protein binding and expands the volume of
distribution
C. Metabolism, because the kidney is the primary organ for phase I oxidative drug metabolism
D. Absorption, because reduced renal function increases gastric acidity and impairs oral drug uptake
Correct Answer: A
Rationale:
Reduced GFR directly impairs renal drug elimination, prolonging half-life and causing drug accumulation unless
doses are adjusted. The kidney performs minimal phase I metabolism, absorption is not primarily affected by GFR,
and while protein binding may change, the primary concern is reduced clearance.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 3
, Q5 Question 5 of 100
A 38-year-old man receives a loading dose of a medication followed by a maintenance dose. The nurse
explains that the loading dose is calculated to achieve a target plasma concentration rapidly. Which factor most
determines the size of the loading dose?
A. The drug's half-life, because longer half-lives require smaller loading doses to reach steady state
B. The drug's clearance rate, because higher clearance requires a proportionally larger loading dose
C. The volume of distribution, because a larger Vd requires a larger loading dose to achieve the desired
plasma concentration
D. The drug's bioavailability, because intravenous drugs always require smaller loading doses than oral
formulations
Correct Answer: C
Rationale:
Loading dose = Target concentration x Volume of distribution / Bioavailability. A drug with a large Vd distributes
widely into tissues, requiring a larger loading dose to achieve the target plasma concentration. Half-life determines
time to steady state, not loading dose size; clearance determines maintenance dose rate.
Q6 Question 6 of 100
A first-year nursing student asks why some drugs require a prescription while others do not. The instructor
explains that the FDA classifies drugs based on safety, abuse potential, and medical use. Under which
schedule would a drug with high abuse potential and no accepted medical use be classified?
A. Schedule II, because these drugs have high abuse potential but accepted medical uses such as opioids
and stimulants
B. Schedule V, because these drugs have the lowest abuse potential among controlled substances
C. Schedule I, because these drugs have high abuse potential and no currently accepted medical use in the
United States
D. Schedule III, because these drugs have moderate abuse potential and include combination products with
limited narcotics
Correct Answer: C
Rationale:
Schedule I drugs (e.g., heroin, LSD) have high abuse potential and no accepted medical use. Schedule II drugs
have high abuse potential but accepted medical uses (e.g., morphine). Schedule III-V drugs have progressively
lower abuse potential. This classification system distinguishes drugs by both abuse risk and therapeutic value.
Pharmacology HESI -- 2026/2027 | Passing Score: 80% | Page 4
