NR 565 Advanced Pharmacology Final
Exam | Practice Questions & Answers
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Q1–Q24)
Q1. A 65-year-old male with cirrhosis is prescribed a medication that undergoes extensive first-
pass hepatic metabolism. The nurse practitioner understands that the bioavailability of this
medication will be significantly affected by which pharmacokinetic alteration?
A. Decreased absorption from the GI tract
B. Reduced first-pass metabolism leading to increased bioavailability
C. Enhanced renal elimination compensating for hepatic impairment
D. Increased protein binding reducing free drug concentration
Correct Answer: B
Rationale: In cirrhosis, first-pass hepatic metabolism is reduced due to damaged
hepatocytes and portosystemic shunting, leading to increased bioavailability of drugs that
normally undergo extensive first-pass metabolism. This requires dose reduction to avoid toxicity
.
Q2. A 42-year-old female is taking warfarin 5 mg daily for atrial fibrillation. She is newly
prescribed amiodarone for rate control. The nurse practitioner recognizes that this drug
interaction is mediated through which mechanism?
A. Amiodarone increases warfarin metabolism via CYP450 induction
B. Amiodarone inhibits warfarin metabolism via CYP2C9 inhibition
C. Amiodarone displaces warfarin from plasma protein binding sites
D. Amiodarone reduces warfarin absorption from the GI tract
Correct Answer: B
Rationale: Amiodarone is a potent CYP2C9 inhibitor that reduces warfarin metabolism,
leading to increased INR and bleeding risk. The warfarin dose typically needs to be reduced by
30–50% .
Q3. A nurse practitioner is prescribing a drug with a narrow therapeutic index. The NP
understands that therapeutic drug monitoring is most important for which reason?
A. To ensure the drug remains below the minimum effective concentration
B. To maintain drug levels within the narrow range between efficacy and toxicity
,C. To confirm patient adherence to the prescribed regimen
D. To reduce the cost of therapy by minimizing drug waste
Correct Answer: B
Rationale: Drugs with narrow therapeutic indices require monitoring to maintain serum
levels within the narrow window between therapeutic efficacy and toxicity. While adherence
confirmation is a secondary benefit, the primary purpose is safety and efficacy within the
therapeutic range .
Q4. A 70-year-old male with reduced creatinine clearance of 35 mL/min is prescribed
gentamicin for a serious infection. The NP adjusts the dosing interval rather than the dose. This
adjustment is based on which pharmacokinetic principle?
A. Reduced renal clearance increases the volume of distribution
B. Decreased renal elimination prolongs the drug half-life requiring longer intervals
C. Renal impairment increases drug absorption from the GI tract
D. Reduced kidney function enhances hepatic metabolism of aminoglycosides
Correct Answer: B
Rationale: In renal impairment, gentamicin elimination is reduced, prolonging the half-life.
Extending the dosing interval allows more time for drug elimination between doses, preventing
accumulation and toxicity while maintaining peak concentrations for efficacy .
Q5. A 55-year-old patient is taking phenytoin for seizure control. The patient presents with
nystagmus and ataxia. The NP suspects phenytoin toxicity and orders a drug level. Which
pharmacokinetic property of phenytoin explains why toxicity can occur even with small dose
increases?
A. Zero-order kinetics (saturation kinetics)
B. First-order kinetics
C. High therapeutic index
D. Rapid renal elimination
Correct Answer: A
Rationale: Phenytoin exhibits zero-order (saturable) kinetics at therapeutic doses. When
metabolic enzymes become saturated, a small increase in dose can produce a
disproportionately large increase in serum concentration, leading to toxicity .
Q6. Which process describes the movement of a drug from the site of administration into the
bloodstream?
,A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Correct Answer: C
Rationale: Absorption refers to the movement of a drug from its administration site into
systemic circulation. Distribution, metabolism, and excretion occur after absorption has taken
place .
Q7. A patient with cirrhosis of the liver is prescribed a medication that undergoes extensive
first-pass metabolism. The nurse anticipates that the bioavailability of this medication will be:
A. Increased due to reduced hepatic function
B. Decreased due to impaired absorption
C. Unchanged because first-pass metabolism occurs in the intestines
D. Variable depending on renal function
Correct Answer: A
Rationale: Cirrhosis reduces liver function, decreasing first-pass metabolism and increasing
bioavailability. This can lead to higher drug levels and increased risk of toxicity, potentially
requiring dose adjustment .
Q8. The study of what the drug does to the body is known as:
A. Pharmacokinetics
B. Pharmacodynamics
C. Pharmacotherapeutics
D. Pharmacogenomics
Correct Answer: B
Rationale: Pharmacodynamics is the study of what a drug does to the body, including
receptor binding, mechanism of action, and therapeutic/toxic effects. Pharmacokinetics
describes what the body does to the drug .
Q9. A drug with a narrow therapeutic index requires:
A. Less frequent monitoring
B. More frequent monitoring of serum drug levels
C. Administration with food only
D. Use only in pediatric patients
, Correct Answer: B
Rationale: Drugs with a narrow therapeutic index (e.g., warfarin, digoxin, lithium,
phenytoin) have a small margin between therapeutic and toxic doses, requiring frequent serum
level monitoring to ensure safety and efficacy .
Q10. Which factor most significantly influences a drug's ability to cross cell membranes?
A. Molecular weight
B. Lipid solubility
C. Route of administration
D. Protein binding
Correct Answer: B
Rationale: Lipid-soluble drugs cross cell membranes more easily via passive diffusion. Lipid
solubility is the primary determinant of membrane permeability, though molecular weight and
protein binding also affect distribution .
Q11. Grapefruit juice inhibits CYP3A4. A patient taking which medication should avoid
grapefruit juice?
A. Acetaminophen
B. Simvastatin
C. Metformin
D. Lisinopril
Correct Answer: B
Rationale: Simvastatin is metabolized by CYP3A4. Grapefruit juice inhibits CYP3A4, leading
to increased simvastatin levels and increased risk of myopathy and rhabdomyolysis .
Q12. What does “bioavailability” refer to?
A. Percentage of drug bound to plasma proteins
B. Amount of drug reaching systemic circulation unchanged
C. Rate of drug elimination
D. Time required for drug metabolism
Correct Answer: B
Rationale: Bioavailability is the fraction of an administered dose that reaches systemic
circulation in active form. IV drugs have 100% bioavailability; oral drugs often have reduced
bioavailability due to first-pass metabolism .
Exam | Practice Questions & Answers
SECTION 1: PHARMACOKINETICS & PHARMACODYNAMICS (Q1–Q24)
Q1. A 65-year-old male with cirrhosis is prescribed a medication that undergoes extensive first-
pass hepatic metabolism. The nurse practitioner understands that the bioavailability of this
medication will be significantly affected by which pharmacokinetic alteration?
A. Decreased absorption from the GI tract
B. Reduced first-pass metabolism leading to increased bioavailability
C. Enhanced renal elimination compensating for hepatic impairment
D. Increased protein binding reducing free drug concentration
Correct Answer: B
Rationale: In cirrhosis, first-pass hepatic metabolism is reduced due to damaged
hepatocytes and portosystemic shunting, leading to increased bioavailability of drugs that
normally undergo extensive first-pass metabolism. This requires dose reduction to avoid toxicity
.
Q2. A 42-year-old female is taking warfarin 5 mg daily for atrial fibrillation. She is newly
prescribed amiodarone for rate control. The nurse practitioner recognizes that this drug
interaction is mediated through which mechanism?
A. Amiodarone increases warfarin metabolism via CYP450 induction
B. Amiodarone inhibits warfarin metabolism via CYP2C9 inhibition
C. Amiodarone displaces warfarin from plasma protein binding sites
D. Amiodarone reduces warfarin absorption from the GI tract
Correct Answer: B
Rationale: Amiodarone is a potent CYP2C9 inhibitor that reduces warfarin metabolism,
leading to increased INR and bleeding risk. The warfarin dose typically needs to be reduced by
30–50% .
Q3. A nurse practitioner is prescribing a drug with a narrow therapeutic index. The NP
understands that therapeutic drug monitoring is most important for which reason?
A. To ensure the drug remains below the minimum effective concentration
B. To maintain drug levels within the narrow range between efficacy and toxicity
,C. To confirm patient adherence to the prescribed regimen
D. To reduce the cost of therapy by minimizing drug waste
Correct Answer: B
Rationale: Drugs with narrow therapeutic indices require monitoring to maintain serum
levels within the narrow window between therapeutic efficacy and toxicity. While adherence
confirmation is a secondary benefit, the primary purpose is safety and efficacy within the
therapeutic range .
Q4. A 70-year-old male with reduced creatinine clearance of 35 mL/min is prescribed
gentamicin for a serious infection. The NP adjusts the dosing interval rather than the dose. This
adjustment is based on which pharmacokinetic principle?
A. Reduced renal clearance increases the volume of distribution
B. Decreased renal elimination prolongs the drug half-life requiring longer intervals
C. Renal impairment increases drug absorption from the GI tract
D. Reduced kidney function enhances hepatic metabolism of aminoglycosides
Correct Answer: B
Rationale: In renal impairment, gentamicin elimination is reduced, prolonging the half-life.
Extending the dosing interval allows more time for drug elimination between doses, preventing
accumulation and toxicity while maintaining peak concentrations for efficacy .
Q5. A 55-year-old patient is taking phenytoin for seizure control. The patient presents with
nystagmus and ataxia. The NP suspects phenytoin toxicity and orders a drug level. Which
pharmacokinetic property of phenytoin explains why toxicity can occur even with small dose
increases?
A. Zero-order kinetics (saturation kinetics)
B. First-order kinetics
C. High therapeutic index
D. Rapid renal elimination
Correct Answer: A
Rationale: Phenytoin exhibits zero-order (saturable) kinetics at therapeutic doses. When
metabolic enzymes become saturated, a small increase in dose can produce a
disproportionately large increase in serum concentration, leading to toxicity .
Q6. Which process describes the movement of a drug from the site of administration into the
bloodstream?
,A. Distribution
B. Metabolism
C. Absorption
D. Excretion
Correct Answer: C
Rationale: Absorption refers to the movement of a drug from its administration site into
systemic circulation. Distribution, metabolism, and excretion occur after absorption has taken
place .
Q7. A patient with cirrhosis of the liver is prescribed a medication that undergoes extensive
first-pass metabolism. The nurse anticipates that the bioavailability of this medication will be:
A. Increased due to reduced hepatic function
B. Decreased due to impaired absorption
C. Unchanged because first-pass metabolism occurs in the intestines
D. Variable depending on renal function
Correct Answer: A
Rationale: Cirrhosis reduces liver function, decreasing first-pass metabolism and increasing
bioavailability. This can lead to higher drug levels and increased risk of toxicity, potentially
requiring dose adjustment .
Q8. The study of what the drug does to the body is known as:
A. Pharmacokinetics
B. Pharmacodynamics
C. Pharmacotherapeutics
D. Pharmacogenomics
Correct Answer: B
Rationale: Pharmacodynamics is the study of what a drug does to the body, including
receptor binding, mechanism of action, and therapeutic/toxic effects. Pharmacokinetics
describes what the body does to the drug .
Q9. A drug with a narrow therapeutic index requires:
A. Less frequent monitoring
B. More frequent monitoring of serum drug levels
C. Administration with food only
D. Use only in pediatric patients
, Correct Answer: B
Rationale: Drugs with a narrow therapeutic index (e.g., warfarin, digoxin, lithium,
phenytoin) have a small margin between therapeutic and toxic doses, requiring frequent serum
level monitoring to ensure safety and efficacy .
Q10. Which factor most significantly influences a drug's ability to cross cell membranes?
A. Molecular weight
B. Lipid solubility
C. Route of administration
D. Protein binding
Correct Answer: B
Rationale: Lipid-soluble drugs cross cell membranes more easily via passive diffusion. Lipid
solubility is the primary determinant of membrane permeability, though molecular weight and
protein binding also affect distribution .
Q11. Grapefruit juice inhibits CYP3A4. A patient taking which medication should avoid
grapefruit juice?
A. Acetaminophen
B. Simvastatin
C. Metformin
D. Lisinopril
Correct Answer: B
Rationale: Simvastatin is metabolized by CYP3A4. Grapefruit juice inhibits CYP3A4, leading
to increased simvastatin levels and increased risk of myopathy and rhabdomyolysis .
Q12. What does “bioavailability” refer to?
A. Percentage of drug bound to plasma proteins
B. Amount of drug reaching systemic circulation unchanged
C. Rate of drug elimination
D. Time required for drug metabolism
Correct Answer: B
Rationale: Bioavailability is the fraction of an administered dose that reaches systemic
circulation in active form. IV drugs have 100% bioavailability; oral drugs often have reduced
bioavailability due to first-pass metabolism .
