KATZUNG'S BASIC AND
CLINICAL PHARMACOLOGY
16TH EDITION
• AUTHOR(S)TODD W.
VANDERAH
TEST BANK
,Question 1
A nurse is teaching a group of nursing students about the
purpose of a phase III clinical trial. Which statement by a
student indicates correct understanding?
A. "It determines whether the drug has activity in laboratory
cell cultures."
B. "It evaluates safety and dosing in a small number of healthy
volunteers."
C. "It compares the new medication with current therapy in a
large patient population."
D. "It monitors adverse effects only after the drug has been
marketed."
Correct Answer: C
Rationale:
Phase III clinical trials typically involve large groups of patients
and compare a new therapy with standard treatment or
placebo to evaluate effectiveness and monitor safety before
regulatory review. Option A describes preclinical research.
Option B describes phase I studies, which primarily assess
safety and dosage. Option D describes phase IV (post-
marketing) surveillance.
Question 2
,A nurse is caring for a patient receiving a medication that acts
as a receptor agonist. Which effect should the nurse anticipate?
A. The medication blocks receptor activation.
B. The medication stimulates a receptor to produce a biologic
response.
C. The medication permanently destroys the receptor.
D. The medication prevents drug metabolism.
Correct Answer: B
Rationale:
An agonist binds to a receptor and activates it, producing a
physiologic response. Antagonists block receptor activation,
making Option A incorrect. Most agonists do not permanently
destroy receptors, eliminating Option C. Drug metabolism is
unrelated to receptor activation, making Option D incorrect.
Question 3
A patient asks why one medication begins working within
minutes while another takes several hours. Which
pharmacokinetic factor most directly influences the onset of
action?
A. Drug absorption
B. Drug potency
, C. Drug efficacy
D. Therapeutic index
Correct Answer: A
Rationale:
Absorption determines how quickly a medication enters the
systemic circulation and can begin producing its effects. Potency
refers to the amount of drug needed to produce an effect.
Efficacy is the maximum therapeutic effect achievable.
Therapeutic index reflects the relative safety of a medication.
Question 4
A nurse explains that a medication has high efficacy. Which
statement accurately describes this characteristic?
A. The medication produces its maximum desired effect when
appropriate doses are used.
B. The medication is effective only in older adults.
C. The medication always has fewer adverse effects.
D. The medication requires very small doses to be effective.
Correct Answer: A
Rationale:
Efficacy describes the maximum therapeutic effect a medication
can produce regardless of dose. It does not guarantee fewer
CLINICAL PHARMACOLOGY
16TH EDITION
• AUTHOR(S)TODD W.
VANDERAH
TEST BANK
,Question 1
A nurse is teaching a group of nursing students about the
purpose of a phase III clinical trial. Which statement by a
student indicates correct understanding?
A. "It determines whether the drug has activity in laboratory
cell cultures."
B. "It evaluates safety and dosing in a small number of healthy
volunteers."
C. "It compares the new medication with current therapy in a
large patient population."
D. "It monitors adverse effects only after the drug has been
marketed."
Correct Answer: C
Rationale:
Phase III clinical trials typically involve large groups of patients
and compare a new therapy with standard treatment or
placebo to evaluate effectiveness and monitor safety before
regulatory review. Option A describes preclinical research.
Option B describes phase I studies, which primarily assess
safety and dosage. Option D describes phase IV (post-
marketing) surveillance.
Question 2
,A nurse is caring for a patient receiving a medication that acts
as a receptor agonist. Which effect should the nurse anticipate?
A. The medication blocks receptor activation.
B. The medication stimulates a receptor to produce a biologic
response.
C. The medication permanently destroys the receptor.
D. The medication prevents drug metabolism.
Correct Answer: B
Rationale:
An agonist binds to a receptor and activates it, producing a
physiologic response. Antagonists block receptor activation,
making Option A incorrect. Most agonists do not permanently
destroy receptors, eliminating Option C. Drug metabolism is
unrelated to receptor activation, making Option D incorrect.
Question 3
A patient asks why one medication begins working within
minutes while another takes several hours. Which
pharmacokinetic factor most directly influences the onset of
action?
A. Drug absorption
B. Drug potency
, C. Drug efficacy
D. Therapeutic index
Correct Answer: A
Rationale:
Absorption determines how quickly a medication enters the
systemic circulation and can begin producing its effects. Potency
refers to the amount of drug needed to produce an effect.
Efficacy is the maximum therapeutic effect achievable.
Therapeutic index reflects the relative safety of a medication.
Question 4
A nurse explains that a medication has high efficacy. Which
statement accurately describes this characteristic?
A. The medication produces its maximum desired effect when
appropriate doses are used.
B. The medication is effective only in older adults.
C. The medication always has fewer adverse effects.
D. The medication requires very small doses to be effective.
Correct Answer: A
Rationale:
Efficacy describes the maximum therapeutic effect a medication
can produce regardless of dose. It does not guarantee fewer
