NR 565 ADVANCED PHARMACOLOGY
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. When a drug is highly protein-bound, what is the clinical significance of a patient having
low serum albumin levels?
A. There is an increased concentration of free drug, increasing risk of toxicity
B. The drug becomes less effective due to rapid excretion
C. The drug’s half-life is significantly extended by the liver
D. The drug will require a higher dose to achieve therapeutic effect
Answer: A
Conceptual Explanation: Drugs that are highly protein-bound (like warfarin) depend on
albumin for transport. Low albumin results in more ‘free’ drug in the bloodstream, which
can lead to toxicity even at standard doses.
2. Which of the following is a potent inhibitor of the CYP3A4 enzyme system, potentially
leading to drug interactions?
A. Rifampin
,B. Grapefruit juice
C. St. John’s Wort
D. Phenytoin
Answer: B
Conceptual Explanation: Grapefruit juice inhibits CYP3A4, leading to decreased
metabolism and increased levels of drugs like statins and CCBs. Rifampin, St. John’s Wort,
and Phenytoin are inducers.
3. The ‘first-pass effect’ primarily occurs after which route of administration?
A. Sublingual
B. Intravenous
C. Oral
D. Transdermal
Answer: C
Conceptual Explanation: Oral medications are absorbed from the GI tract into the portal
circulation and pass through the liver, where significant metabolism can occur before
reaching systemic circulation.
4. A patient with a creatinine clearance of 30 mL/min is prescribed a drug primarily excreted
by the kidneys. What adjustment is usually necessary?
A. Increase the dose
, B. Shorten the dosing interval
C. Switch to an oral route to delay absorption
D. Reduce the dose or lengthen the interval
Answer: D
Conceptual Explanation: Renal impairment requires dose reduction or extended intervals
to prevent drug accumulation and toxicity when the drug is renally cleared.
5. Which pharmacokinetic parameter describes the time required for the plasma
concentration of a drug to decrease by 50%?
A. Half-life
B. Volume of distribution
C. Bioavailability
D. Clearance
Answer: A
Conceptual Explanation: Half-life (t1/2) is the time it takes for the concentration of the
drug in the plasma to fall to half its original value.
6. Which phase of drug metabolism involves conjugation reactions like glucuronidation?
A. Phase II
B. Phase I
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. When a drug is highly protein-bound, what is the clinical significance of a patient having
low serum albumin levels?
A. There is an increased concentration of free drug, increasing risk of toxicity
B. The drug becomes less effective due to rapid excretion
C. The drug’s half-life is significantly extended by the liver
D. The drug will require a higher dose to achieve therapeutic effect
Answer: A
Conceptual Explanation: Drugs that are highly protein-bound (like warfarin) depend on
albumin for transport. Low albumin results in more ‘free’ drug in the bloodstream, which
can lead to toxicity even at standard doses.
2. Which of the following is a potent inhibitor of the CYP3A4 enzyme system, potentially
leading to drug interactions?
A. Rifampin
,B. Grapefruit juice
C. St. John’s Wort
D. Phenytoin
Answer: B
Conceptual Explanation: Grapefruit juice inhibits CYP3A4, leading to decreased
metabolism and increased levels of drugs like statins and CCBs. Rifampin, St. John’s Wort,
and Phenytoin are inducers.
3. The ‘first-pass effect’ primarily occurs after which route of administration?
A. Sublingual
B. Intravenous
C. Oral
D. Transdermal
Answer: C
Conceptual Explanation: Oral medications are absorbed from the GI tract into the portal
circulation and pass through the liver, where significant metabolism can occur before
reaching systemic circulation.
4. A patient with a creatinine clearance of 30 mL/min is prescribed a drug primarily excreted
by the kidneys. What adjustment is usually necessary?
A. Increase the dose
, B. Shorten the dosing interval
C. Switch to an oral route to delay absorption
D. Reduce the dose or lengthen the interval
Answer: D
Conceptual Explanation: Renal impairment requires dose reduction or extended intervals
to prevent drug accumulation and toxicity when the drug is renally cleared.
5. Which pharmacokinetic parameter describes the time required for the plasma
concentration of a drug to decrease by 50%?
A. Half-life
B. Volume of distribution
C. Bioavailability
D. Clearance
Answer: A
Conceptual Explanation: Half-life (t1/2) is the time it takes for the concentration of the
drug in the plasma to fall to half its original value.
6. Which phase of drug metabolism involves conjugation reactions like glucuronidation?
A. Phase II
B. Phase I
