NURS 6521 ADVANCED PHARMACOLOGY (PDF) | 2026 EXAM
QUESTIONS AND ANSWERS + RATIONALES | STUDY GUIDE |
100% CORRECT
1. A patient asks why a higher dose of a medication is needed orally compared to IV. What
is the nurse's best response regarding this phenomenon?
A) "Oral medications are absorbed faster, so they are broken down quicker."
B) "The liver metabolizes a portion of the oral drug before it reaches the bloodstream."
C) "Oral medications bind to protein in the stomach, making them inactive."
D) "The kidneys filter out oral medications more efficiently than IV medications."
Correct Answer: B) "The liver metabolizes a portion of the oral drug before it reaches the
bloodstream."
Rationale: This describes the first-pass effect. Orally administered drugs are absorbed from the
GI tract and carried via the hepatic portal system to the liver, where significant metabolism may
occur before reaching systemic circulation . Oral absorption is generally slower than IV, protein
binding occurs in blood not the stomach, and renal filtration depends on blood flow, not the route
of administration.
2. A drug has a half-life of 12 hours. How long will it take to reach steady state?
A) 12 hours
B) 24 hours
C) 60 hours
D) 72 hours
Correct Answer: C) 60 hours
Rationale: Steady state is typically achieved after approximately 4-5 half-lives. Therefore, 12
hours x 5 = 60 hours . One half-life (12 hours) is insufficient for accumulation, two half-lives (24
hours) is approximately 75% of steady state, and six half-lives (72 hours) is slightly beyond the
standard 4-5 half-life rule.
3. A nurse is reviewing lab results and notes a drug has a narrow therapeutic index (NTI).
What is the primary implication of this characteristic?
A) The drug has a wide margin of safety.
B) The drug requires routine monitoring of serum levels.
C) The drug does not require dosage adjustments.
D) The drug is safe for over-the-counter use.
Correct Answer: B) The drug requires routine monitoring of serum levels.
Rationale: A narrow therapeutic index means the difference between the minimum effective
concentration and the toxic concentration is small . Small changes in dose or metabolism can
lead to toxicity, necessitating close monitoring (e.g., Warfarin, Digoxin, Phenytoin). A wide
,therapeutic index describes safe drugs; NTI drugs almost always require precise adjustments and
are prescription-only.
4. A patient is taking Drug A and a newly prescribed Drug B. The nurse notes that Drug B
displaces Drug A from plasma albumin. What is the expected result?
A) Decreased effect of Drug A
B) Increased free fraction of Drug A
C) Increased excretion of Drug A
D) Decreased absorption of Drug B
Correct Answer: B) Increased free fraction of Drug A
Rationale: Displacement from protein binding sites increases the amount of free (unbound) drug
in circulation . Only free drug is pharmacologically active, potentially increasing the effect and
risk of toxicity of Drug A. Displacement doesn't directly affect excretion or absorption.
5. A patient requires a drug that is a weak acid. The nurse understands that excretion of this
drug will be accelerated if the urine pH is:
A) Acidic
B) Alkaline
C) Neutral
D) The pH does not affect excretion
Correct Answer: B) Alkaline
Rationale: Weak acids ionize in alkaline urine (pH > 7). Ionized drugs are trapped in the renal
tubule and cannot be reabsorbed, leading to faster excretion. Acidification of urine would trap
weak bases, not acids.
6. A patient with hepatic impairment needs a drug that undergoes extensive first-pass
metabolism. The NP should expect:
A) Decreased bioavailability
B) Increased bioavailability
C) No change in bioavailability
D) Increased protein binding
Correct Answer: B) Increased bioavailability
Rationale: First-pass metabolism occurs in the liver. Hepatic impairment reduces metabolism,
leading to increased bioavailability and risk of toxicity . Decreased bioavailability would occur
with increased metabolism, not impairment.
7. Which CYP450 enzyme is responsible for metabolism of approximately 50% of drugs
and is induced by rifampin?
A) CYP2D6
B) CYP2C19
C) CYP3A4
D) CYP1A2
, Correct Answer: C) CYP3A4
Rationale: CYP3A4 metabolizes the majority of drugs . Rifampin, carbamazepine, and St. John's
wort are strong inducers of CYP3A4. CYP2D6 and CYP2C19 metabolize fewer drugs, and
CYP1A2 is primarily involved in caffeine metabolism.
8. A patient on warfarin starts amiodarone. The NP anticipates:
A) Decreased INR, increase warfarin dose
B) Increased INR, decrease warfarin dose
C) No interaction
D) Switch to heparin
Correct Answer: B) Increased INR, decrease warfarin dose
Rationale: Amiodarone inhibits CYP2C9, which metabolizes warfarin, leading to decreased
warfarin metabolism and increased INR . The warfarin dose should be reduced by 30-50% to
prevent bleeding complications.
9. A drug with a half-life of 6 hours reaches steady state in:
A) 6 hours
B) 12 hours
C) 18 hours
D) 24-30 hours
Correct Answer: D) 24-30 hours
Rationale: Steady state is achieved after 4-5 half-lives . With a 6-hour half-life: 6 hours x 4-5 =
24-30 hours. One half-life (6 hours) is insufficient, two half-lives (12 hours) is approximately
75% of steady state.
10. Phase I metabolism primarily involves:
A) Conjugation
B) Oxidation, reduction, hydrolysis
C) Glucuronidation
D) Acetylation
Correct Answer: B) Oxidation, reduction, hydrolysis
Rationale: Phase I metabolism involves oxidation, reduction, and hydrolysis reactions, primarily
mediated by the CYP450 enzyme system . Phase II metabolism involves conjugation reactions
such as glucuronidation and acetylation.
11. Which beta-blocker is cardioselective and safer in patients with asthma?
A) Propranolol
B) Nadolol
C) Metoprolol
D) Carvedilol
Correct Answer: C) Metoprolol
QUESTIONS AND ANSWERS + RATIONALES | STUDY GUIDE |
100% CORRECT
1. A patient asks why a higher dose of a medication is needed orally compared to IV. What
is the nurse's best response regarding this phenomenon?
A) "Oral medications are absorbed faster, so they are broken down quicker."
B) "The liver metabolizes a portion of the oral drug before it reaches the bloodstream."
C) "Oral medications bind to protein in the stomach, making them inactive."
D) "The kidneys filter out oral medications more efficiently than IV medications."
Correct Answer: B) "The liver metabolizes a portion of the oral drug before it reaches the
bloodstream."
Rationale: This describes the first-pass effect. Orally administered drugs are absorbed from the
GI tract and carried via the hepatic portal system to the liver, where significant metabolism may
occur before reaching systemic circulation . Oral absorption is generally slower than IV, protein
binding occurs in blood not the stomach, and renal filtration depends on blood flow, not the route
of administration.
2. A drug has a half-life of 12 hours. How long will it take to reach steady state?
A) 12 hours
B) 24 hours
C) 60 hours
D) 72 hours
Correct Answer: C) 60 hours
Rationale: Steady state is typically achieved after approximately 4-5 half-lives. Therefore, 12
hours x 5 = 60 hours . One half-life (12 hours) is insufficient for accumulation, two half-lives (24
hours) is approximately 75% of steady state, and six half-lives (72 hours) is slightly beyond the
standard 4-5 half-life rule.
3. A nurse is reviewing lab results and notes a drug has a narrow therapeutic index (NTI).
What is the primary implication of this characteristic?
A) The drug has a wide margin of safety.
B) The drug requires routine monitoring of serum levels.
C) The drug does not require dosage adjustments.
D) The drug is safe for over-the-counter use.
Correct Answer: B) The drug requires routine monitoring of serum levels.
Rationale: A narrow therapeutic index means the difference between the minimum effective
concentration and the toxic concentration is small . Small changes in dose or metabolism can
lead to toxicity, necessitating close monitoring (e.g., Warfarin, Digoxin, Phenytoin). A wide
,therapeutic index describes safe drugs; NTI drugs almost always require precise adjustments and
are prescription-only.
4. A patient is taking Drug A and a newly prescribed Drug B. The nurse notes that Drug B
displaces Drug A from plasma albumin. What is the expected result?
A) Decreased effect of Drug A
B) Increased free fraction of Drug A
C) Increased excretion of Drug A
D) Decreased absorption of Drug B
Correct Answer: B) Increased free fraction of Drug A
Rationale: Displacement from protein binding sites increases the amount of free (unbound) drug
in circulation . Only free drug is pharmacologically active, potentially increasing the effect and
risk of toxicity of Drug A. Displacement doesn't directly affect excretion or absorption.
5. A patient requires a drug that is a weak acid. The nurse understands that excretion of this
drug will be accelerated if the urine pH is:
A) Acidic
B) Alkaline
C) Neutral
D) The pH does not affect excretion
Correct Answer: B) Alkaline
Rationale: Weak acids ionize in alkaline urine (pH > 7). Ionized drugs are trapped in the renal
tubule and cannot be reabsorbed, leading to faster excretion. Acidification of urine would trap
weak bases, not acids.
6. A patient with hepatic impairment needs a drug that undergoes extensive first-pass
metabolism. The NP should expect:
A) Decreased bioavailability
B) Increased bioavailability
C) No change in bioavailability
D) Increased protein binding
Correct Answer: B) Increased bioavailability
Rationale: First-pass metabolism occurs in the liver. Hepatic impairment reduces metabolism,
leading to increased bioavailability and risk of toxicity . Decreased bioavailability would occur
with increased metabolism, not impairment.
7. Which CYP450 enzyme is responsible for metabolism of approximately 50% of drugs
and is induced by rifampin?
A) CYP2D6
B) CYP2C19
C) CYP3A4
D) CYP1A2
, Correct Answer: C) CYP3A4
Rationale: CYP3A4 metabolizes the majority of drugs . Rifampin, carbamazepine, and St. John's
wort are strong inducers of CYP3A4. CYP2D6 and CYP2C19 metabolize fewer drugs, and
CYP1A2 is primarily involved in caffeine metabolism.
8. A patient on warfarin starts amiodarone. The NP anticipates:
A) Decreased INR, increase warfarin dose
B) Increased INR, decrease warfarin dose
C) No interaction
D) Switch to heparin
Correct Answer: B) Increased INR, decrease warfarin dose
Rationale: Amiodarone inhibits CYP2C9, which metabolizes warfarin, leading to decreased
warfarin metabolism and increased INR . The warfarin dose should be reduced by 30-50% to
prevent bleeding complications.
9. A drug with a half-life of 6 hours reaches steady state in:
A) 6 hours
B) 12 hours
C) 18 hours
D) 24-30 hours
Correct Answer: D) 24-30 hours
Rationale: Steady state is achieved after 4-5 half-lives . With a 6-hour half-life: 6 hours x 4-5 =
24-30 hours. One half-life (6 hours) is insufficient, two half-lives (12 hours) is approximately
75% of steady state.
10. Phase I metabolism primarily involves:
A) Conjugation
B) Oxidation, reduction, hydrolysis
C) Glucuronidation
D) Acetylation
Correct Answer: B) Oxidation, reduction, hydrolysis
Rationale: Phase I metabolism involves oxidation, reduction, and hydrolysis reactions, primarily
mediated by the CYP450 enzyme system . Phase II metabolism involves conjugation reactions
such as glucuronidation and acetylation.
11. Which beta-blocker is cardioselective and safer in patients with asthma?
A) Propranolol
B) Nadolol
C) Metoprolol
D) Carvedilol
Correct Answer: C) Metoprolol
