NURS 6521 MIDTERM ADVANCED
PHARMACOLOGY EXAM STUDY GUIDE
QUESTIONS AND ANSWERS 100%
VERIFIED BY EXPERTS. 2026/2027
1. A patient with chronic kidney disease requires a medication that is primarily excreted
renally. What adjustment should the prescriber anticipate?
A. Decrease the dose or increase the dosing interval.
B. Decrease the dosing interval to maintain serum concentrations.
C. Increase the loading dose to reach steady state faster.
D. Change the route of administration to intramuscular.
Answer: A
Conceptual Explanation: In renal impairment, the clearance of drugs excreted by the
kidneys is reduced, leading to potential toxicity if the dose is not decreased or the interval
between doses increased.
2. Which statement best describes the ‘First-Pass Effect’?
A. The rapid distribution of drug to the brain via the blood-brain barrier.
B. The excretion of a drug via the biliary system into the feces.
C. The initial binding of a drug to albumin in the plasma.
,D. The metabolism of a drug by the liver before it reaches systemic circulation.
Answer: D
Conceptual Explanation: The first-pass effect occurs when an oral medication is absorbed
from the GI tract and carried to the liver via the portal vein, where it is extensively
metabolized before reaching the rest of the body.
3. A drug has a half-life of 4 hours. How many hours will it take for approximately 94% of the
drug to be eliminated from the body?
A. 8 hours
B. 16 hours
C. 12 hours
D. 24 hours
Answer: B
Conceptual Explanation: It takes approximately 4 to 5 half-lives to eliminate a drug. 4
hours multiplied by 4 half-lives equals 16 hours.
4. An agonist is a drug that:
A. Binds to a receptor and prevents activation by endogenous substances.
B. Has affinity for a receptor but zero intrinsic activity.
C. Irreversibly binds to a receptor to permanently disable it.
D. Binds to a receptor and mimics the effects of endogenous regulatory molecules.
, Answer: D
Conceptual Explanation: Agonists are molecules that activate receptors; they possess
both affinity and high intrinsic activity, mimicking natural ligands.
5. Which Cytochrome P450 enzyme interaction occurs when a patient drinks grapefruit juice
while taking certain medications?
A. Induction of CYP3A4, leading to decreased drug levels.
B. Inhibition of CYP3A4, leading to increased drug levels.
C. Competition for renal tubular secretion.
D. Increased gastric pH, preventing absorption.
Answer: B
Conceptual Explanation: Grapefruit juice inhibits the CYP3A4 isoenzyme in the intestinal
wall, which decreases the metabolism of many drugs, thereby increasing their serum
concentrations and risk of toxicity.
6. When prescribing a drug with a narrow therapeutic index, which action is most critical?
A. Instructing the patient to take the drug with food.
B. Advocating for a generic version to save costs.
C. Using a loading dose for all patients.
D. Monitoring serum drug levels frequently.
Answer: D
PHARMACOLOGY EXAM STUDY GUIDE
QUESTIONS AND ANSWERS 100%
VERIFIED BY EXPERTS. 2026/2027
1. A patient with chronic kidney disease requires a medication that is primarily excreted
renally. What adjustment should the prescriber anticipate?
A. Decrease the dose or increase the dosing interval.
B. Decrease the dosing interval to maintain serum concentrations.
C. Increase the loading dose to reach steady state faster.
D. Change the route of administration to intramuscular.
Answer: A
Conceptual Explanation: In renal impairment, the clearance of drugs excreted by the
kidneys is reduced, leading to potential toxicity if the dose is not decreased or the interval
between doses increased.
2. Which statement best describes the ‘First-Pass Effect’?
A. The rapid distribution of drug to the brain via the blood-brain barrier.
B. The excretion of a drug via the biliary system into the feces.
C. The initial binding of a drug to albumin in the plasma.
,D. The metabolism of a drug by the liver before it reaches systemic circulation.
Answer: D
Conceptual Explanation: The first-pass effect occurs when an oral medication is absorbed
from the GI tract and carried to the liver via the portal vein, where it is extensively
metabolized before reaching the rest of the body.
3. A drug has a half-life of 4 hours. How many hours will it take for approximately 94% of the
drug to be eliminated from the body?
A. 8 hours
B. 16 hours
C. 12 hours
D. 24 hours
Answer: B
Conceptual Explanation: It takes approximately 4 to 5 half-lives to eliminate a drug. 4
hours multiplied by 4 half-lives equals 16 hours.
4. An agonist is a drug that:
A. Binds to a receptor and prevents activation by endogenous substances.
B. Has affinity for a receptor but zero intrinsic activity.
C. Irreversibly binds to a receptor to permanently disable it.
D. Binds to a receptor and mimics the effects of endogenous regulatory molecules.
, Answer: D
Conceptual Explanation: Agonists are molecules that activate receptors; they possess
both affinity and high intrinsic activity, mimicking natural ligands.
5. Which Cytochrome P450 enzyme interaction occurs when a patient drinks grapefruit juice
while taking certain medications?
A. Induction of CYP3A4, leading to decreased drug levels.
B. Inhibition of CYP3A4, leading to increased drug levels.
C. Competition for renal tubular secretion.
D. Increased gastric pH, preventing absorption.
Answer: B
Conceptual Explanation: Grapefruit juice inhibits the CYP3A4 isoenzyme in the intestinal
wall, which decreases the metabolism of many drugs, thereby increasing their serum
concentrations and risk of toxicity.
6. When prescribing a drug with a narrow therapeutic index, which action is most critical?
A. Instructing the patient to take the drug with food.
B. Advocating for a generic version to save costs.
C. Using a loading dose for all patients.
D. Monitoring serum drug levels frequently.
Answer: D
