NSG 5544 ADVANCED PHARMACOLOGY QUIZ
1 WINTER 2026 | South College | 100% Correct |
NP Exam | Pass Guaranteed - A+ Graded
[Section 1: Pharmacokinetics & Pharmacodynamics (Q1-12)]
Q1. A 68-year-old male with heart failure is prescribed digoxin. The NP understands
that digoxin has a narrow therapeutic index. Which pharmacokinetic parameter is
MOST critical to monitor to prevent toxicity?
A. Volume of distribution
B. Plasma protein binding
C. Therapeutic drug monitoring of serum levels [CORRECT]
D. First-pass metabolism
Rationale: Digoxin has a narrow therapeutic index (0.5-2.0 ng/mL), making serum
level monitoring essential to prevent toxicity. Volume of distribution and protein
binding affect dosing but don't directly prevent toxicity. First-pass metabolism is
minimal for digoxin.
Correct Answer: C
Q2. A patient taking warfarin is started on amiodarone for atrial fibrillation. The NP
anticipates an increased INR because amiodarone inhibits which CYP450 enzyme
primarily responsible for warfarin metabolism?
A. CYP3A4
B. CYP2C9 [CORRECT]
C. CYP1A2
D. CYP2D6
,Rationale: Warfarin's S-enantiomer (more potent) is metabolized primarily by
CYP2C9. Amiodarone inhibits CYP2C9, increasing warfarin levels and INR. CYP3A4
metabolizes the R-enantiomer less potently, while CYP1A2 and CYP2D6 are not
primary warfarin metabolizers.
Correct Answer: B
Q3. A 55-year-old female with epilepsy requires a loading dose of phenytoin. The NP
calculates the dose using the volume of distribution (Vd). If the desired plasma
concentration is 15 mcg/mL and Vd is 0.7 L/kg for a 70-kg patient, what is the
approximate loading dose?
A. 490 mg
B. 735 mg [CORRECT]
C. 1050 mg
D. 150 mg
Rationale: Loading dose = Desired concentration × Vd × Weight. 15 mcg/mL × 0.7
L/kg × 70 kg = 15 × 0.7 × 70 = 735 mg. Option A uses 10 mcg/mL, C uses 20
mcg/mL, D is a maintenance dose approximation.
Correct Answer: B
Q4. Which pharmacodynamic concept BEST explains why a beta-blocker like
metoprolol reduces heart rate?
A. Non-competitive antagonism
B. Competitive antagonism at beta-1 adrenergic receptors [CORRECT]
C. Physiologic antagonism
D. Chemical antagonism
, Rationale: Metoprolol is a competitive antagonist at beta-1 receptors, blocking
catecholamine binding and reducing chronotropic effects. Non-competitive
antagonism is irreversible, physiologic antagonism involves opposing effects at
different receptors, and chemical antagonism involves direct binding.
Correct Answer: B
Q5. A drug has a half-life of 6 hours. Approximately how long will it take to reach
steady-state concentration with daily dosing?
A. 6 hours
B. 12 hours
C. 24-30 hours [CORRECT]
D. 48 hours
Rationale: Steady-state is reached in approximately 4-5 half-lives. With a 6-hour half-
life: 5 × 6 = 30 hours (approximately 24-30 hours). Option A is one half-life (50%
accumulation), B is two half-lives (75%), D exceeds the typical steady-state
timeframe.
Correct Answer: C
Q6. A patient with liver cirrhosis is prescribed lorazepam. The NP should expect
which pharmacokinetic alteration?
A. Increased drug absorption
B. Decreased phase I metabolism (oxidation) leading to prolonged drug effect
[CORRECT]
C. Increased renal excretion
D. Decreased volume of distribution
1 WINTER 2026 | South College | 100% Correct |
NP Exam | Pass Guaranteed - A+ Graded
[Section 1: Pharmacokinetics & Pharmacodynamics (Q1-12)]
Q1. A 68-year-old male with heart failure is prescribed digoxin. The NP understands
that digoxin has a narrow therapeutic index. Which pharmacokinetic parameter is
MOST critical to monitor to prevent toxicity?
A. Volume of distribution
B. Plasma protein binding
C. Therapeutic drug monitoring of serum levels [CORRECT]
D. First-pass metabolism
Rationale: Digoxin has a narrow therapeutic index (0.5-2.0 ng/mL), making serum
level monitoring essential to prevent toxicity. Volume of distribution and protein
binding affect dosing but don't directly prevent toxicity. First-pass metabolism is
minimal for digoxin.
Correct Answer: C
Q2. A patient taking warfarin is started on amiodarone for atrial fibrillation. The NP
anticipates an increased INR because amiodarone inhibits which CYP450 enzyme
primarily responsible for warfarin metabolism?
A. CYP3A4
B. CYP2C9 [CORRECT]
C. CYP1A2
D. CYP2D6
,Rationale: Warfarin's S-enantiomer (more potent) is metabolized primarily by
CYP2C9. Amiodarone inhibits CYP2C9, increasing warfarin levels and INR. CYP3A4
metabolizes the R-enantiomer less potently, while CYP1A2 and CYP2D6 are not
primary warfarin metabolizers.
Correct Answer: B
Q3. A 55-year-old female with epilepsy requires a loading dose of phenytoin. The NP
calculates the dose using the volume of distribution (Vd). If the desired plasma
concentration is 15 mcg/mL and Vd is 0.7 L/kg for a 70-kg patient, what is the
approximate loading dose?
A. 490 mg
B. 735 mg [CORRECT]
C. 1050 mg
D. 150 mg
Rationale: Loading dose = Desired concentration × Vd × Weight. 15 mcg/mL × 0.7
L/kg × 70 kg = 15 × 0.7 × 70 = 735 mg. Option A uses 10 mcg/mL, C uses 20
mcg/mL, D is a maintenance dose approximation.
Correct Answer: B
Q4. Which pharmacodynamic concept BEST explains why a beta-blocker like
metoprolol reduces heart rate?
A. Non-competitive antagonism
B. Competitive antagonism at beta-1 adrenergic receptors [CORRECT]
C. Physiologic antagonism
D. Chemical antagonism
, Rationale: Metoprolol is a competitive antagonist at beta-1 receptors, blocking
catecholamine binding and reducing chronotropic effects. Non-competitive
antagonism is irreversible, physiologic antagonism involves opposing effects at
different receptors, and chemical antagonism involves direct binding.
Correct Answer: B
Q5. A drug has a half-life of 6 hours. Approximately how long will it take to reach
steady-state concentration with daily dosing?
A. 6 hours
B. 12 hours
C. 24-30 hours [CORRECT]
D. 48 hours
Rationale: Steady-state is reached in approximately 4-5 half-lives. With a 6-hour half-
life: 5 × 6 = 30 hours (approximately 24-30 hours). Option A is one half-life (50%
accumulation), B is two half-lives (75%), D exceeds the typical steady-state
timeframe.
Correct Answer: C
Q6. A patient with liver cirrhosis is prescribed lorazepam. The NP should expect
which pharmacokinetic alteration?
A. Increased drug absorption
B. Decreased phase I metabolism (oxidation) leading to prolonged drug effect
[CORRECT]
C. Increased renal excretion
D. Decreased volume of distribution
