NURS 6521 Final Exam
2026/2027 V3 Winter Quarter | Walden University
Advanced Pharmacology - Complete Exam with Accurate Questions & Answers
100 Questions | 8 Sections | Comprehensive Review Bundle
ANSWER KEY INCLUDED - For Review and Study Purposes Only
Section 1: Pharmacokinetics, Pharmacodynamics, and Drug Therapy Principles
Q1: A nurse is reviewing the pharmacokinetics of a newly prescribed medication. The patient asks why
the oral dose is higher than the intravenous dose. Which response by the nurse is most accurate?
A. Oral medications are less potent than intravenous medications
B. The first-pass effect reduces the amount of drug reaching systemic circulation [CORRECT]
C. Oral medications have a shorter half-life than intravenous medications
D. Intravenous medications bypass protein binding in the blood
Correct Answer: B
Rationale: The first-pass effect refers to the metabolism of a drug by the liver before it reaches systemic circulation,
significantly reducing bioavailability of oral medications. This is why oral doses are often higher than IV doses to achieve
the same therapeutic effect. Option A is incorrect because potency refers to the dose required to produce an effect, not the
route. Option C is incorrect because half-life is independent of route of administration. Option D is incorrect because both
oral and IV medications undergo protein binding.
Q2: A patient with chronic kidney disease has a creatinine clearance of 25 mL/min. The nurse anticipates
that the prescriber will adjust the dosage of which type of medication?
A. Highly protein-bound medications
B. Medications metabolized by CYP3A4
C. Medications primarily excreted unchanged by the kidneys [CORRECT]
D. Lipophilic medications with large volumes of distribution
Correct Answer: C
Rationale: Medications that are primarily excreted unchanged by the kidneys require dosage adjustment in patients with
decreased renal function because reduced creatinine clearance impairs drug elimination, leading to accumulation and
potential toxicity. Option A is incorrect because protein binding affects distribution, not renal excretion directly. Option B is
incorrect because CYP3A4 metabolism occurs in the liver, not the kidneys. Option D is incorrect because a large volume of
distribution means the drug is concentrated in tissues rather than available for renal excretion.
Q3: A patient taking warfarin is started on rifampin for tuberculosis. The nurse should anticipate which
change in the patient's warfarin therapy?
A. Increased INR requiring a decreased warfarin dose
B. Decreased INR requiring an increased warfarin dose [CORRECT]
C. No change in INR because they use different metabolic pathways
D. Increased risk of bleeding requiring vitamin K supplementation
Correct Answer: B
NURS 6521 Final Exam 2026/2027 | Page 1
,Rationale: Rifampin is a potent CYP450 inducer that increases the metabolism of warfarin (a CYP2C9 substrate), leading to
decreased warfarin levels and a reduced INR. The warfarin dose will likely need to be increased to maintain therapeutic
anticoagulation. Option A describes the opposite effect. Option C is incorrect because rifampin induces CYP enzymes that
metabolize warfarin. Option D is incorrect because the risk decreases, not increases, and vitamin K would further lower the
INR.
Q4: A nursing student asks the instructor about the therapeutic index of a medication. Which statement
by the instructor is most accurate?
A. A narrow therapeutic index means the drug is ineffective at any dose
B. A narrow therapeutic index indicates a small margin between therapeutic and toxic doses [CORRECT]
C. The therapeutic index is calculated by dividing the effective dose by the toxic dose
D. A wide therapeutic index requires more frequent therapeutic drug monitoring
Correct Answer: B
Rationale: The therapeutic index (TI) is the ratio of the toxic dose to the effective dose (TD50/ED50). A narrow TI means
there is a small margin between the dose that produces a therapeutic effect and the dose that causes toxicity, requiring
careful monitoring. Option A is incorrect because a narrow TI does not mean the drug is ineffective. Option C is incorrect
because the TI is TD50/ED50, not ED50/TD50. Option D is incorrect because a wide TI means the drug is safer and needs
less monitoring, while a narrow TI requires more frequent TDM.
Q5: A patient is prescribed a medication that is a CYP3A4 substrate. The nurse should teach the patient to
avoid which food or supplement?
A. Calcium-fortified orange juice
B. Grapefruit juice [CORRECT]
C. Green leafy vegetables
D. St. John's Wort
Correct Answer: B
Rationale: Grapefruit juice is a CYP3A4 inhibitor that decreases the metabolism of CYP3A4 substrates, leading to increased
drug levels and potential toxicity. This is a well-documented interaction relevant to many medications including certain
statins, calcium channel blockers, and immunosuppressants. Option A (calcium) affects absorption of some drugs like
fluoroquinolones but not CYP3A4. Option C (vitamin K in greens) affects warfarin, not CYP3A4. Option D (St. John's Wort)
is a CYP450 inducer which would decrease drug levels, not increase them.
Q6: An 80-year-old patient is prescribed multiple medications for chronic conditions. The nurse is most
concerned about which age-related pharmacokinetic change?
A. Increased gastric pH leading to enhanced drug absorption
B. Decreased renal clearance leading to drug accumulation [CORRECT]
C. Increased hepatic Phase II metabolism leading to rapid drug breakdown
D. Increased albumin levels leading to decreased free drug availability
Correct Answer: B
Rationale: Aging is associated with decreased renal function due to reduced glomerular filtration rate, which impairs
clearance of renally eliminated drugs and leads to drug accumulation and increased risk of toxicity. This is the most
significant pharmacokinetic change in older adults. Option A is partially true (gastric pH does increase) but this generally
decreases absorption of weak acids, not enhances it. Option C is incorrect because Phase I metabolism decreases with age,
not Phase II. Option D is incorrect because albumin levels actually decrease with age, increasing free drug availability and
risk of adverse effects.
Q7: A pregnant patient at 28 weeks' gestation is diagnosed with a bacterial infection. The nurse knows
that which FDA pregnancy category is associated with the highest risk of fetal harm?
A. Category A
B. Category B
NURS 6521 Final Exam 2026/2027 | Page 2
, C. Category D
D. Category X [CORRECT]
Correct Answer: D
Rationale: Category X drugs have demonstrated fetal abnormalities in humans or animals, and the risks clearly outweigh
any potential benefits. These drugs are absolutely contraindicated in pregnancy. Category A drugs have shown no risk in
human studies. Category B drugs have shown no risk in animal studies or slight risk in animals not confirmed in humans.
Category D drugs have shown positive evidence of risk but benefits may outweigh risks in certain situations.
Q8: A patient is receiving a drug with a half-life of 12 hours. Approximately how long will it take for the
drug to reach steady-state concentration?
A. 12 hours
B. 24 hours
C. 48 to 60 hours [CORRECT]
D. 72 to 96 hours
Correct Answer: C
Rationale: Steady state is achieved after approximately 4 to 5 half-lives. For a drug with a 12-hour half-life, this would be 48
to 60 hours (4 x 12 = 48; 5 x 12 = 60). This principle is critical for determining when to draw therapeutic drug monitoring
levels and when to expect full therapeutic effects. Option A represents only one half-life. Option B represents two half-lives,
at which point only 75% of steady state is reached. Option D exceeds the necessary time frame.
Q9: A patient experiencing an adverse drug reaction develops symptoms of nausea, vomiting, and skin
rash within hours of starting a new antibiotic. The nurse recognizes this as which type of adverse drug
reaction?
A. Type A - Augmented (predictable, dose-dependent)
B. Type B - Bizarre (idiosyncratic, unpredictable) [CORRECT]
C. Type C - Chronic (dose and time dependent)
D. Type D - Delayed (time-dependent)
Correct Answer: B
Rationale: Type B (Bizarre) adverse drug reactions are idiosyncratic and unpredictable, not related to the drug's
pharmacological action. Skin rash is a classic Type B reaction representing an allergic or hypersensitivity response that is
not dose-dependent. Type A reactions are predictable and dose-dependent (e.g., bleeding from warfarin). Type C reactions
are chronic and related to cumulative dose (e.g., osteoporosis from corticosteroids). Type D reactions are delayed (e.g.,
teratogenicity, carcinogenicity).
Q10: A nurse is administering a highly protein-bound medication (98% bound) to a patient with
hypoalbuminemia. The nurse should anticipate which effect?
A. Decreased drug effect due to reduced total drug levels
B. Increased drug effect due to more free (unbound) drug available [CORRECT]
C. No change in drug effect because free drug levels remain constant
D. Rapid drug elimination due to increased renal clearance
Correct Answer: B
Rationale: Hypoalbuminemia reduces the number of available protein-binding sites, which increases the fraction of free
(unbound) drug. Since only free drug is pharmacologically active, this leads to an increased drug effect and higher risk of
toxicity at the same total dose. Option A is incorrect because although total drug levels may decrease, free drug increases.
Option C is incorrect because free drug levels do change. Option D is incorrect because the primary concern is increased
effect, not increased clearance of the unbound portion.
Q11: A pediatric patient is prescribed a medication dosed at 10 mg/kg/day. The child weighs 30 kg. What
is the total daily dose?
A. 100 mg
NURS 6521 Final Exam 2026/2027 | Page 3
2026/2027 V3 Winter Quarter | Walden University
Advanced Pharmacology - Complete Exam with Accurate Questions & Answers
100 Questions | 8 Sections | Comprehensive Review Bundle
ANSWER KEY INCLUDED - For Review and Study Purposes Only
Section 1: Pharmacokinetics, Pharmacodynamics, and Drug Therapy Principles
Q1: A nurse is reviewing the pharmacokinetics of a newly prescribed medication. The patient asks why
the oral dose is higher than the intravenous dose. Which response by the nurse is most accurate?
A. Oral medications are less potent than intravenous medications
B. The first-pass effect reduces the amount of drug reaching systemic circulation [CORRECT]
C. Oral medications have a shorter half-life than intravenous medications
D. Intravenous medications bypass protein binding in the blood
Correct Answer: B
Rationale: The first-pass effect refers to the metabolism of a drug by the liver before it reaches systemic circulation,
significantly reducing bioavailability of oral medications. This is why oral doses are often higher than IV doses to achieve
the same therapeutic effect. Option A is incorrect because potency refers to the dose required to produce an effect, not the
route. Option C is incorrect because half-life is independent of route of administration. Option D is incorrect because both
oral and IV medications undergo protein binding.
Q2: A patient with chronic kidney disease has a creatinine clearance of 25 mL/min. The nurse anticipates
that the prescriber will adjust the dosage of which type of medication?
A. Highly protein-bound medications
B. Medications metabolized by CYP3A4
C. Medications primarily excreted unchanged by the kidneys [CORRECT]
D. Lipophilic medications with large volumes of distribution
Correct Answer: C
Rationale: Medications that are primarily excreted unchanged by the kidneys require dosage adjustment in patients with
decreased renal function because reduced creatinine clearance impairs drug elimination, leading to accumulation and
potential toxicity. Option A is incorrect because protein binding affects distribution, not renal excretion directly. Option B is
incorrect because CYP3A4 metabolism occurs in the liver, not the kidneys. Option D is incorrect because a large volume of
distribution means the drug is concentrated in tissues rather than available for renal excretion.
Q3: A patient taking warfarin is started on rifampin for tuberculosis. The nurse should anticipate which
change in the patient's warfarin therapy?
A. Increased INR requiring a decreased warfarin dose
B. Decreased INR requiring an increased warfarin dose [CORRECT]
C. No change in INR because they use different metabolic pathways
D. Increased risk of bleeding requiring vitamin K supplementation
Correct Answer: B
NURS 6521 Final Exam 2026/2027 | Page 1
,Rationale: Rifampin is a potent CYP450 inducer that increases the metabolism of warfarin (a CYP2C9 substrate), leading to
decreased warfarin levels and a reduced INR. The warfarin dose will likely need to be increased to maintain therapeutic
anticoagulation. Option A describes the opposite effect. Option C is incorrect because rifampin induces CYP enzymes that
metabolize warfarin. Option D is incorrect because the risk decreases, not increases, and vitamin K would further lower the
INR.
Q4: A nursing student asks the instructor about the therapeutic index of a medication. Which statement
by the instructor is most accurate?
A. A narrow therapeutic index means the drug is ineffective at any dose
B. A narrow therapeutic index indicates a small margin between therapeutic and toxic doses [CORRECT]
C. The therapeutic index is calculated by dividing the effective dose by the toxic dose
D. A wide therapeutic index requires more frequent therapeutic drug monitoring
Correct Answer: B
Rationale: The therapeutic index (TI) is the ratio of the toxic dose to the effective dose (TD50/ED50). A narrow TI means
there is a small margin between the dose that produces a therapeutic effect and the dose that causes toxicity, requiring
careful monitoring. Option A is incorrect because a narrow TI does not mean the drug is ineffective. Option C is incorrect
because the TI is TD50/ED50, not ED50/TD50. Option D is incorrect because a wide TI means the drug is safer and needs
less monitoring, while a narrow TI requires more frequent TDM.
Q5: A patient is prescribed a medication that is a CYP3A4 substrate. The nurse should teach the patient to
avoid which food or supplement?
A. Calcium-fortified orange juice
B. Grapefruit juice [CORRECT]
C. Green leafy vegetables
D. St. John's Wort
Correct Answer: B
Rationale: Grapefruit juice is a CYP3A4 inhibitor that decreases the metabolism of CYP3A4 substrates, leading to increased
drug levels and potential toxicity. This is a well-documented interaction relevant to many medications including certain
statins, calcium channel blockers, and immunosuppressants. Option A (calcium) affects absorption of some drugs like
fluoroquinolones but not CYP3A4. Option C (vitamin K in greens) affects warfarin, not CYP3A4. Option D (St. John's Wort)
is a CYP450 inducer which would decrease drug levels, not increase them.
Q6: An 80-year-old patient is prescribed multiple medications for chronic conditions. The nurse is most
concerned about which age-related pharmacokinetic change?
A. Increased gastric pH leading to enhanced drug absorption
B. Decreased renal clearance leading to drug accumulation [CORRECT]
C. Increased hepatic Phase II metabolism leading to rapid drug breakdown
D. Increased albumin levels leading to decreased free drug availability
Correct Answer: B
Rationale: Aging is associated with decreased renal function due to reduced glomerular filtration rate, which impairs
clearance of renally eliminated drugs and leads to drug accumulation and increased risk of toxicity. This is the most
significant pharmacokinetic change in older adults. Option A is partially true (gastric pH does increase) but this generally
decreases absorption of weak acids, not enhances it. Option C is incorrect because Phase I metabolism decreases with age,
not Phase II. Option D is incorrect because albumin levels actually decrease with age, increasing free drug availability and
risk of adverse effects.
Q7: A pregnant patient at 28 weeks' gestation is diagnosed with a bacterial infection. The nurse knows
that which FDA pregnancy category is associated with the highest risk of fetal harm?
A. Category A
B. Category B
NURS 6521 Final Exam 2026/2027 | Page 2
, C. Category D
D. Category X [CORRECT]
Correct Answer: D
Rationale: Category X drugs have demonstrated fetal abnormalities in humans or animals, and the risks clearly outweigh
any potential benefits. These drugs are absolutely contraindicated in pregnancy. Category A drugs have shown no risk in
human studies. Category B drugs have shown no risk in animal studies or slight risk in animals not confirmed in humans.
Category D drugs have shown positive evidence of risk but benefits may outweigh risks in certain situations.
Q8: A patient is receiving a drug with a half-life of 12 hours. Approximately how long will it take for the
drug to reach steady-state concentration?
A. 12 hours
B. 24 hours
C. 48 to 60 hours [CORRECT]
D. 72 to 96 hours
Correct Answer: C
Rationale: Steady state is achieved after approximately 4 to 5 half-lives. For a drug with a 12-hour half-life, this would be 48
to 60 hours (4 x 12 = 48; 5 x 12 = 60). This principle is critical for determining when to draw therapeutic drug monitoring
levels and when to expect full therapeutic effects. Option A represents only one half-life. Option B represents two half-lives,
at which point only 75% of steady state is reached. Option D exceeds the necessary time frame.
Q9: A patient experiencing an adverse drug reaction develops symptoms of nausea, vomiting, and skin
rash within hours of starting a new antibiotic. The nurse recognizes this as which type of adverse drug
reaction?
A. Type A - Augmented (predictable, dose-dependent)
B. Type B - Bizarre (idiosyncratic, unpredictable) [CORRECT]
C. Type C - Chronic (dose and time dependent)
D. Type D - Delayed (time-dependent)
Correct Answer: B
Rationale: Type B (Bizarre) adverse drug reactions are idiosyncratic and unpredictable, not related to the drug's
pharmacological action. Skin rash is a classic Type B reaction representing an allergic or hypersensitivity response that is
not dose-dependent. Type A reactions are predictable and dose-dependent (e.g., bleeding from warfarin). Type C reactions
are chronic and related to cumulative dose (e.g., osteoporosis from corticosteroids). Type D reactions are delayed (e.g.,
teratogenicity, carcinogenicity).
Q10: A nurse is administering a highly protein-bound medication (98% bound) to a patient with
hypoalbuminemia. The nurse should anticipate which effect?
A. Decreased drug effect due to reduced total drug levels
B. Increased drug effect due to more free (unbound) drug available [CORRECT]
C. No change in drug effect because free drug levels remain constant
D. Rapid drug elimination due to increased renal clearance
Correct Answer: B
Rationale: Hypoalbuminemia reduces the number of available protein-binding sites, which increases the fraction of free
(unbound) drug. Since only free drug is pharmacologically active, this leads to an increased drug effect and higher risk of
toxicity at the same total dose. Option A is incorrect because although total drug levels may decrease, free drug increases.
Option C is incorrect because free drug levels do change. Option D is incorrect because the primary concern is increased
effect, not increased clearance of the unbound portion.
Q11: A pediatric patient is prescribed a medication dosed at 10 mg/kg/day. The child weighs 30 kg. What
is the total daily dose?
A. 100 mg
NURS 6521 Final Exam 2026/2027 | Page 3
