1
NU 518 QUIZ 3 2026/2027 | ADVANCED
PHARMACOLOGY | 50 VERIFIED Q&A |
DETAILED RATIONALES | NGN-ALIGNED |
PASS GUARANTEED – A+ GRADED
SECTION 1: PHARMACOKINETICS AND PHARMACODYNAMICS - Questions 1-10
Q1: Gastric Emptying and Drug Absorption
The student is reviewing factors affecting drug absorption. Which condition would delay the onset of
action of an orally administered drug?
A. Increased gastric emptying
B. Decreased gastric emptying
C. Increased intestinal motility
D. Increased gastric acid secretion
Correct Answer: B
Rationale: Decreased gastric emptying delays the transit of the drug to the small intestine, where
most absorption occurs. This delays the onset of action. Conditions that decrease gastric emptying
include food, anticholinergic drugs, and opioid analgesics. Increased gastric emptying would speed
absorption. [100% CORRECT]
Q2: First-Pass Effect and Bioavailability
The student is reviewing bioavailability. A drug has an oral bioavailability of 20%. What does this
indicate?
A. 80% of the drug is excreted unchanged in urine
B. 20% of the drug reaches systemic circulation unchanged
C. 20% of the drug is metabolized in the liver
D. 80% of the drug is absorbed from the GI tract
Correct Answer: B
Rationale: Bioavailability is the fraction of an administered dose that reaches systemic circulation
unchanged. An oral bioavailability of 20% means only 20% of the drug reaches systemic circulation,
likely due to incomplete absorption and/or first-pass metabolism. [100% CORRECT]
Q3: Volume of Distribution and Drug Distribution
The student is reviewing volume of distribution. A drug has a volume of distribution (Vd) of 3 L/kg.
What does this indicate about the drug?
,2
A. It is extensively distributed into tissues
B. It is confined to the vascular space
C. It has high plasma protein binding
D. It is poorly absorbed
Correct Answer: A
Rationale: A Vd greater than 1 L/kg indicates extensive distribution into tissues. Drugs with high Vd
are often lipophilic and have low plasma protein binding. A Vd of 0.1 L/kg would indicate
confinement to the vascular space. [100% CORRECT]
Q4: Half-Life and Dosing Interval
The student is reviewing half-life. A drug has a half-life of 8 hours. If the therapeutic range is 10-20
mg/L and the drug follows first-order kinetics, approximately how long will it take to eliminate 75%
of the drug?
A. 8 hours
B. 16 hours
C. 24 hours
D. 32 hours
Correct Answer: B
Rationale: 75% elimination requires 2 half-lives (50% after 1 half-life, 75% after 2). 2 × 8 hours = 16
hours. [100% CORRECT]
Q5: Protein Binding and Drug Interactions
The student is reviewing drug interactions. A patient is taking warfarin (99% protein-bound). Which
drug would most likely increase the risk of bleeding by displacing warfarin from albumin?
A. Aspirin
B. Phenylbutazone
C. Acetaminophen
D. Metformin
Correct Answer: B
Rationale: Phenylbutazone is highly protein-bound and can displace warfarin from albumin,
increasing the free (active) fraction of warfarin and enhancing its anticoagulant effect. Aspirin
increases bleeding risk by inhibiting platelets, not by displacement. Acetaminophen and metformin
do not significantly displace warfarin. [100% CORRECT]
Q6: Zero-Order Kinetics
The student is reviewing elimination kinetics. Which statement is true for a drug following zero-
order kinetics?
, 3
A. The rate of elimination is proportional to plasma concentration
B. A constant fraction of the drug is eliminated per unit time
C. A constant amount of drug is eliminated per unit time
D. The half-life is constant regardless of concentration
Correct Answer: C
Rationale: Zero-order kinetics means a constant amount of drug is eliminated per unit time,
regardless of plasma concentration. This occurs when metabolic enzymes are saturated. The half-life
is not constant; it increases with higher concentrations. First-order kinetics involves a constant
fraction eliminated per unit time. [100% CORRECT]
Q7: Therapeutic Index
The student is reviewing drug safety. A drug has an ED50 of 5 mg and an LD50 of 50 mg. What is the
therapeutic index?
A. 0.1
B. 1
C. 10
D. 100
Correct Answer: C
Rationale: Therapeutic index (TI) = LD50 / ED50 = 50 mg / 5 mg = 10. A higher TI indicates a safer
drug. [100% CORRECT]
Q8: Enzyme Inhibition and Drug Levels
The student is reviewing drug interactions. A patient taking warfarin is prescribed fluconazole, a
CYP2C9 inhibitor. What is the expected effect?
A. Decreased warfarin levels and reduced anticoagulant effect
B. Increased warfarin levels and increased bleeding risk
C. No change in warfarin levels
D. Increased warfarin metabolism
Correct Answer: B
Rationale: Fluconazole inhibits CYP2C9, which metabolizes warfarin. This reduces warfarin
metabolism, leading to increased plasma levels, enhanced anticoagulant effect, and increased
bleeding risk. [100% CORRECT]
Q9: Pharmacogenomics and Clopidogrel
The student is reviewing pharmacogenomics. A patient is a CYP2C19 poor metabolizer. Which drug's
efficacy may be reduced?
A. Clopidogrel
B. Warfarin
NU 518 QUIZ 3 2026/2027 | ADVANCED
PHARMACOLOGY | 50 VERIFIED Q&A |
DETAILED RATIONALES | NGN-ALIGNED |
PASS GUARANTEED – A+ GRADED
SECTION 1: PHARMACOKINETICS AND PHARMACODYNAMICS - Questions 1-10
Q1: Gastric Emptying and Drug Absorption
The student is reviewing factors affecting drug absorption. Which condition would delay the onset of
action of an orally administered drug?
A. Increased gastric emptying
B. Decreased gastric emptying
C. Increased intestinal motility
D. Increased gastric acid secretion
Correct Answer: B
Rationale: Decreased gastric emptying delays the transit of the drug to the small intestine, where
most absorption occurs. This delays the onset of action. Conditions that decrease gastric emptying
include food, anticholinergic drugs, and opioid analgesics. Increased gastric emptying would speed
absorption. [100% CORRECT]
Q2: First-Pass Effect and Bioavailability
The student is reviewing bioavailability. A drug has an oral bioavailability of 20%. What does this
indicate?
A. 80% of the drug is excreted unchanged in urine
B. 20% of the drug reaches systemic circulation unchanged
C. 20% of the drug is metabolized in the liver
D. 80% of the drug is absorbed from the GI tract
Correct Answer: B
Rationale: Bioavailability is the fraction of an administered dose that reaches systemic circulation
unchanged. An oral bioavailability of 20% means only 20% of the drug reaches systemic circulation,
likely due to incomplete absorption and/or first-pass metabolism. [100% CORRECT]
Q3: Volume of Distribution and Drug Distribution
The student is reviewing volume of distribution. A drug has a volume of distribution (Vd) of 3 L/kg.
What does this indicate about the drug?
,2
A. It is extensively distributed into tissues
B. It is confined to the vascular space
C. It has high plasma protein binding
D. It is poorly absorbed
Correct Answer: A
Rationale: A Vd greater than 1 L/kg indicates extensive distribution into tissues. Drugs with high Vd
are often lipophilic and have low plasma protein binding. A Vd of 0.1 L/kg would indicate
confinement to the vascular space. [100% CORRECT]
Q4: Half-Life and Dosing Interval
The student is reviewing half-life. A drug has a half-life of 8 hours. If the therapeutic range is 10-20
mg/L and the drug follows first-order kinetics, approximately how long will it take to eliminate 75%
of the drug?
A. 8 hours
B. 16 hours
C. 24 hours
D. 32 hours
Correct Answer: B
Rationale: 75% elimination requires 2 half-lives (50% after 1 half-life, 75% after 2). 2 × 8 hours = 16
hours. [100% CORRECT]
Q5: Protein Binding and Drug Interactions
The student is reviewing drug interactions. A patient is taking warfarin (99% protein-bound). Which
drug would most likely increase the risk of bleeding by displacing warfarin from albumin?
A. Aspirin
B. Phenylbutazone
C. Acetaminophen
D. Metformin
Correct Answer: B
Rationale: Phenylbutazone is highly protein-bound and can displace warfarin from albumin,
increasing the free (active) fraction of warfarin and enhancing its anticoagulant effect. Aspirin
increases bleeding risk by inhibiting platelets, not by displacement. Acetaminophen and metformin
do not significantly displace warfarin. [100% CORRECT]
Q6: Zero-Order Kinetics
The student is reviewing elimination kinetics. Which statement is true for a drug following zero-
order kinetics?
, 3
A. The rate of elimination is proportional to plasma concentration
B. A constant fraction of the drug is eliminated per unit time
C. A constant amount of drug is eliminated per unit time
D. The half-life is constant regardless of concentration
Correct Answer: C
Rationale: Zero-order kinetics means a constant amount of drug is eliminated per unit time,
regardless of plasma concentration. This occurs when metabolic enzymes are saturated. The half-life
is not constant; it increases with higher concentrations. First-order kinetics involves a constant
fraction eliminated per unit time. [100% CORRECT]
Q7: Therapeutic Index
The student is reviewing drug safety. A drug has an ED50 of 5 mg and an LD50 of 50 mg. What is the
therapeutic index?
A. 0.1
B. 1
C. 10
D. 100
Correct Answer: C
Rationale: Therapeutic index (TI) = LD50 / ED50 = 50 mg / 5 mg = 10. A higher TI indicates a safer
drug. [100% CORRECT]
Q8: Enzyme Inhibition and Drug Levels
The student is reviewing drug interactions. A patient taking warfarin is prescribed fluconazole, a
CYP2C9 inhibitor. What is the expected effect?
A. Decreased warfarin levels and reduced anticoagulant effect
B. Increased warfarin levels and increased bleeding risk
C. No change in warfarin levels
D. Increased warfarin metabolism
Correct Answer: B
Rationale: Fluconazole inhibits CYP2C9, which metabolizes warfarin. This reduces warfarin
metabolism, leading to increased plasma levels, enhanced anticoagulant effect, and increased
bleeding risk. [100% CORRECT]
Q9: Pharmacogenomics and Clopidogrel
The student is reviewing pharmacogenomics. A patient is a CYP2C19 poor metabolizer. Which drug's
efficacy may be reduced?
A. Clopidogrel
B. Warfarin
