NR 565 / NR565 Advanced Pharmacology Final Exam
Review Practice Test Actual 2025/2026 with Detailed
Rationales | 100% Verified | Pass Guaranteed – A+
Graded
SECTION 1: Pharmacokinetics & Pharmacodynamics (18 questions)
Q1: A patient with cirrhosis is prescribed lorazepam for anxiety. The nurse
practitioner selects this benzodiazepine over diazepam because lorazepam:
A. Is metabolized by oxidation, which is faster in liver disease
B. Undergoes glucuronidation, which is relatively preserved in hepatic impairment
[CORRECT]
C. Is a prodrug requiring hepatic activation to become active
D. Has a longer half-life and therefore requires less frequent dosing
Correct Answer: B
Rationale: Lorazepam undergoes glucuronidation (Phase II metabolism), which is
relatively preserved in liver disease compared to oxidation (Phase I metabolism)
used by diazepam, making it safer in patients with hepatic impairment.
Q2: A patient taking warfarin achieves a stable INR of 2.5. After starting amiodarone,
the INR rises to 5.2. This interaction is best explained by which mechanism?
A. Amiodarone induces CYP2C9, increasing warfarin metabolism
,B. Amiodarone inhibits CYP2C9, decreasing S-warfarin metabolism [CORRECT]
C. Amiodarone displaces warfarin from albumin binding sites
D. Amiodarone increases renal excretion of warfarin
Correct Answer: B
Rationale: Amiodarone is a potent inhibitor of CYP2C9, the primary enzyme
responsible for metabolizing S-warfarin (the more potent isomer), leading to
decreased warfarin clearance and increased anticoagulant effect.
Q3: A drug has an ED50 of 10 mg and an LD50 of 100 mg. What is the therapeutic
index?
A. 1
B. 10 [CORRECT]
C. 100
D. 110
Correct Answer: B
Rationale: The therapeutic index is calculated as LD50 divided by ED50 (100/10 =
10); a higher therapeutic index indicates a wider safety margin between effective and
toxic doses.
Q4: A patient with renal failure receives a loading dose of vancomycin but no
maintenance doses. The loading dose is based primarily on which pharmacokinetic
parameter?
A. Volume of distribution, to achieve the target concentration immediately
[CORRECT]
,B. Clearance, to maintain the steady-state concentration
C. Half-life, to determine the dosing interval
D. Bioavailability, to compensate for first-pass metabolism
Correct Answer: A
Rationale: The loading dose is calculated based on the volume of distribution and
the desired target plasma concentration to rapidly achieve therapeutic levels,
independent of clearance or half-life.
Q5: A patient taking phenytoin has subtherapeutic drug levels despite adherence.
The nurse practitioner discovers the patient takes antacids with each dose. This
interaction occurs through which mechanism?
A. Antacids increase phenytoin metabolism via CYP induction
B. Antacids decrease phenytoin absorption by increasing gastric pH [CORRECT]
C. Antacids displace phenytoin from plasma proteins
D. Antacids increase phenytoin renal excretion
Correct Answer: B
Rationale: Antacids increase gastric pH, which can reduce the dissolution and
absorption of weakly acidic drugs like phenytoin; concurrent administration should
be separated by at least 2 hours.
Q6: A patient asks why the initial dose of digoxin is higher than subsequent
maintenance doses. The nurse practitioner explains that this is based on which
pharmacokinetic principle?
A. Loading doses are used to achieve steady-state concentration rapidly [CORRECT]
, B. Loading doses increase the therapeutic index of the drug
C. Loading doses prevent first-pass metabolism
D. Loading doses increase the volume of distribution
Correct Answer: A
Rationale: A loading dose rapidly achieves the target steady-state plasma
concentration that would otherwise require approximately 4-5 half-lives to reach with
maintenance dosing alone.
Q7: Which factor most significantly increases the volume of distribution of lipophilic
drugs in elderly patients?
A. Decreased total body water and increased body fat [CORRECT]
B. Increased cardiac output and enhanced perfusion
C. Decreased plasma protein binding and hypoalbuminemia
D. Increased hepatic blood flow and enzyme activity
Correct Answer: A
Rationale: Aging increases adipose tissue and decreases total body water; lipophilic
drugs distribute extensively into fat compartments, increasing their volume of
distribution and potentially prolonging their half-life.
Q8: A patient is prescribed propranolol and soon develops wheezing and
bronchospasm. The nurse practitioner recognizes this as an adverse effect related to
which pharmacodynamic property?
A. Non-selective beta-adrenergic blockade affecting beta-2 receptors in the lungs
[CORRECT]
Review Practice Test Actual 2025/2026 with Detailed
Rationales | 100% Verified | Pass Guaranteed – A+
Graded
SECTION 1: Pharmacokinetics & Pharmacodynamics (18 questions)
Q1: A patient with cirrhosis is prescribed lorazepam for anxiety. The nurse
practitioner selects this benzodiazepine over diazepam because lorazepam:
A. Is metabolized by oxidation, which is faster in liver disease
B. Undergoes glucuronidation, which is relatively preserved in hepatic impairment
[CORRECT]
C. Is a prodrug requiring hepatic activation to become active
D. Has a longer half-life and therefore requires less frequent dosing
Correct Answer: B
Rationale: Lorazepam undergoes glucuronidation (Phase II metabolism), which is
relatively preserved in liver disease compared to oxidation (Phase I metabolism)
used by diazepam, making it safer in patients with hepatic impairment.
Q2: A patient taking warfarin achieves a stable INR of 2.5. After starting amiodarone,
the INR rises to 5.2. This interaction is best explained by which mechanism?
A. Amiodarone induces CYP2C9, increasing warfarin metabolism
,B. Amiodarone inhibits CYP2C9, decreasing S-warfarin metabolism [CORRECT]
C. Amiodarone displaces warfarin from albumin binding sites
D. Amiodarone increases renal excretion of warfarin
Correct Answer: B
Rationale: Amiodarone is a potent inhibitor of CYP2C9, the primary enzyme
responsible for metabolizing S-warfarin (the more potent isomer), leading to
decreased warfarin clearance and increased anticoagulant effect.
Q3: A drug has an ED50 of 10 mg and an LD50 of 100 mg. What is the therapeutic
index?
A. 1
B. 10 [CORRECT]
C. 100
D. 110
Correct Answer: B
Rationale: The therapeutic index is calculated as LD50 divided by ED50 (100/10 =
10); a higher therapeutic index indicates a wider safety margin between effective and
toxic doses.
Q4: A patient with renal failure receives a loading dose of vancomycin but no
maintenance doses. The loading dose is based primarily on which pharmacokinetic
parameter?
A. Volume of distribution, to achieve the target concentration immediately
[CORRECT]
,B. Clearance, to maintain the steady-state concentration
C. Half-life, to determine the dosing interval
D. Bioavailability, to compensate for first-pass metabolism
Correct Answer: A
Rationale: The loading dose is calculated based on the volume of distribution and
the desired target plasma concentration to rapidly achieve therapeutic levels,
independent of clearance or half-life.
Q5: A patient taking phenytoin has subtherapeutic drug levels despite adherence.
The nurse practitioner discovers the patient takes antacids with each dose. This
interaction occurs through which mechanism?
A. Antacids increase phenytoin metabolism via CYP induction
B. Antacids decrease phenytoin absorption by increasing gastric pH [CORRECT]
C. Antacids displace phenytoin from plasma proteins
D. Antacids increase phenytoin renal excretion
Correct Answer: B
Rationale: Antacids increase gastric pH, which can reduce the dissolution and
absorption of weakly acidic drugs like phenytoin; concurrent administration should
be separated by at least 2 hours.
Q6: A patient asks why the initial dose of digoxin is higher than subsequent
maintenance doses. The nurse practitioner explains that this is based on which
pharmacokinetic principle?
A. Loading doses are used to achieve steady-state concentration rapidly [CORRECT]
, B. Loading doses increase the therapeutic index of the drug
C. Loading doses prevent first-pass metabolism
D. Loading doses increase the volume of distribution
Correct Answer: A
Rationale: A loading dose rapidly achieves the target steady-state plasma
concentration that would otherwise require approximately 4-5 half-lives to reach with
maintenance dosing alone.
Q7: Which factor most significantly increases the volume of distribution of lipophilic
drugs in elderly patients?
A. Decreased total body water and increased body fat [CORRECT]
B. Increased cardiac output and enhanced perfusion
C. Decreased plasma protein binding and hypoalbuminemia
D. Increased hepatic blood flow and enzyme activity
Correct Answer: A
Rationale: Aging increases adipose tissue and decreases total body water; lipophilic
drugs distribute extensively into fat compartments, increasing their volume of
distribution and potentially prolonging their half-life.
Q8: A patient is prescribed propranolol and soon develops wheezing and
bronchospasm. The nurse practitioner recognizes this as an adverse effect related to
which pharmacodynamic property?
A. Non-selective beta-adrenergic blockade affecting beta-2 receptors in the lungs
[CORRECT]
