NR566 | NR566 Advanced Pharmacology for Care
of the Family Wk 2 Midterm v3 | Questions with
Correct Answers and Expert Explanation for Each
Question | Chamberlain
1. Which phase of pharmacokinetics is most significantly affected by the first-pass
effect when a drug is administered orally?
A. Distribution
B. Metabolism
C. Excretion
D. Absorption
Correct Answer: B
Expert Explanation: The first-pass effect occurs when a drug is metabolized by the
liver before it reaches the systemic circulation. This phenomenon primarily occurs
with oral medications that are absorbed into the portal venous system.
Understanding this process is crucial for determining why certain drugs require
higher oral doses compared to parenteral doses.
2. When prescribing a drug with a narrow therapeutic index, the nurse practitioner
understands that:
A. The therapeutic dose is very close to the toxic dose.
,B. The drug is very safe even at high doses.
C. The drug does not require serum level monitoring.
D. The drug has a high margin of safety.
Correct Answer: A
Expert Explanation: A narrow therapeutic index means that there is a small
difference between the dose that produces a beneficial effect and the dose that
causes toxicity. Patients taking these medications often require frequent blood tests
to ensure levels stay within a safe range. Close monitoring is essential to prevent
adverse outcomes and maintain efficacy.
3. An elderly patient has a reduced level of serum albumin. How might this affect the
distribution of a highly protein-bound drug?
A. The drug will be excreted faster.
B. There will be a decrease in the free drug concentration.
C. The drug will not be absorbed properly.
D. There will be an increase in the free drug concentration.
Correct Answer: D
Expert Explanation: Serum albumin is the primary protein that binds to acidic
drugs in the bloodstream. If albumin levels are low, there are fewer binding sites
,available, leading to more ‘free’ or active drug circulating. This increase in free drug
concentration can lead to enhanced pharmacological effects and a higher risk of
toxicity.
4. The nurse practitioner is considering the half-life of a drug. What does a half-life of
4 hours indicate?
A. It takes 4 hours for the drug to reach steady state.
B. The drug will be completely eliminated in 4 hours.
C. Half of the drug is absorbed every 4 hours.
D. Fifty percent of the drug is eliminated from the body every 4 hours.
Correct Answer: D
Expert Explanation: The half-life of a drug is the time required for the
concentration of the drug in the plasma to decrease by 50 percent. This value helps
clinicians determine the frequency of dosing needed to maintain therapeutic levels.
Generally, it takes about four to five half-lives for a drug to be almost entirely
eliminated from the body.
5. Which of the following describes a drug that acts as an agonist?
A. It binds to a receptor and produces a biological response.
B. It blocks the receptor site to prevent activation.
, C. It reduces the effect of an endogenous ligand.
D. It competes with other drugs for protein binding.
Correct Answer: A
Expert Explanation: An agonist is a substance that binds to a specific receptor and
triggers a response that mimics the action of naturally occurring substances.
Agonists possess both affinity for the receptor and intrinsic activity to activate it. In
clinical practice, agonists are used to enhance physiological processes that are
underactive.
6. A patient is prescribed a drug that is a known CYP450 inducer. What is the likely
effect on a second drug metabolized by the same enzyme?
A. The concentration of the second drug will decrease.
B. The concentration of the second drug will increase.
C. The second drug will become more toxic.
D. There will be no change in the second drug’s concentration.
Correct Answer: A
Expert Explanation: CYP450 inducers increase the activity and production of
metabolic enzymes in the liver. This leads to a faster rate of metabolism for drugs
of the Family Wk 2 Midterm v3 | Questions with
Correct Answers and Expert Explanation for Each
Question | Chamberlain
1. Which phase of pharmacokinetics is most significantly affected by the first-pass
effect when a drug is administered orally?
A. Distribution
B. Metabolism
C. Excretion
D. Absorption
Correct Answer: B
Expert Explanation: The first-pass effect occurs when a drug is metabolized by the
liver before it reaches the systemic circulation. This phenomenon primarily occurs
with oral medications that are absorbed into the portal venous system.
Understanding this process is crucial for determining why certain drugs require
higher oral doses compared to parenteral doses.
2. When prescribing a drug with a narrow therapeutic index, the nurse practitioner
understands that:
A. The therapeutic dose is very close to the toxic dose.
,B. The drug is very safe even at high doses.
C. The drug does not require serum level monitoring.
D. The drug has a high margin of safety.
Correct Answer: A
Expert Explanation: A narrow therapeutic index means that there is a small
difference between the dose that produces a beneficial effect and the dose that
causes toxicity. Patients taking these medications often require frequent blood tests
to ensure levels stay within a safe range. Close monitoring is essential to prevent
adverse outcomes and maintain efficacy.
3. An elderly patient has a reduced level of serum albumin. How might this affect the
distribution of a highly protein-bound drug?
A. The drug will be excreted faster.
B. There will be a decrease in the free drug concentration.
C. The drug will not be absorbed properly.
D. There will be an increase in the free drug concentration.
Correct Answer: D
Expert Explanation: Serum albumin is the primary protein that binds to acidic
drugs in the bloodstream. If albumin levels are low, there are fewer binding sites
,available, leading to more ‘free’ or active drug circulating. This increase in free drug
concentration can lead to enhanced pharmacological effects and a higher risk of
toxicity.
4. The nurse practitioner is considering the half-life of a drug. What does a half-life of
4 hours indicate?
A. It takes 4 hours for the drug to reach steady state.
B. The drug will be completely eliminated in 4 hours.
C. Half of the drug is absorbed every 4 hours.
D. Fifty percent of the drug is eliminated from the body every 4 hours.
Correct Answer: D
Expert Explanation: The half-life of a drug is the time required for the
concentration of the drug in the plasma to decrease by 50 percent. This value helps
clinicians determine the frequency of dosing needed to maintain therapeutic levels.
Generally, it takes about four to five half-lives for a drug to be almost entirely
eliminated from the body.
5. Which of the following describes a drug that acts as an agonist?
A. It binds to a receptor and produces a biological response.
B. It blocks the receptor site to prevent activation.
, C. It reduces the effect of an endogenous ligand.
D. It competes with other drugs for protein binding.
Correct Answer: A
Expert Explanation: An agonist is a substance that binds to a specific receptor and
triggers a response that mimics the action of naturally occurring substances.
Agonists possess both affinity for the receptor and intrinsic activity to activate it. In
clinical practice, agonists are used to enhance physiological processes that are
underactive.
6. A patient is prescribed a drug that is a known CYP450 inducer. What is the likely
effect on a second drug metabolized by the same enzyme?
A. The concentration of the second drug will decrease.
B. The concentration of the second drug will increase.
C. The second drug will become more toxic.
D. There will be no change in the second drug’s concentration.
Correct Answer: A
Expert Explanation: CYP450 inducers increase the activity and production of
metabolic enzymes in the liver. This leads to a faster rate of metabolism for drugs
