NSG 533 EXAM 1 – WILKES ADVANCED
PHARMACOLOGY (2026/2027) ACTUAL
QUESTIONS & STUDY GUIDE
1. Which pharmacokinetic process is most significantly affected by the ‘first-pass effect’ when
a drug is administered orally?
A. Absorption
B. Excretion
C. Distribution
D. Metabolism
Answer: D
Conceptual Explanation: The first-pass effect refers to the rapid hepatic metabolism of a
drug as it passes from the gastrointestinal tract through the portal vein to the liver before
reaching systemic circulation.
2. A patient is prescribed a drug that is known to be a potent CYP450 inducer. What effect will
this have on a co-administered drug that is a substrate of the same enzyme system?
A. Increased plasma levels of the substrate drug
,B. Decreased plasma levels of the substrate drug
C. Increased risk of substrate drug toxicity
D. No change in drug levels
Answer: B
Conceptual Explanation: CYP450 inducers speed up the metabolism of substrate drugs,
leading to decreased plasma concentrations and potentially sub-therapeutic effects.
3. What term describes the concentration of a drug required to produce 50% of its maximum
effect?
A. Efficacy
B. Potency (EC50)
C. Therapeutic Index
D. Affinity
Answer: B
Conceptual Explanation: Potency is often expressed as the EC50 (effective concentration),
which is the dose required to achieve half of the drug’s maximal response.
4. Which of the following describes an ‘agonist’ in pharmacodynamics?
A. A drug that binds to a receptor and prevents activation
B. A drug that competes with the endogenous ligand for the active site
, C. A drug that binds to a receptor and activates it to produce a biological response
D. A drug that permanently denatures the receptor protein
Answer: C
Conceptual Explanation: An agonist mimics the action of endogenous ligands by binding
to and activating specific receptors.
5. How many half-lives are generally required for a drug to reach steady-state concentration
in the plasma?
A. 4 to 5 half-lives
B. 1 to 2 half-lives
C. 8 to 10 half-lives
D. Exactly 3 half-lives
Answer: A
Conceptual Explanation: Steady state occurs when the rate of drug administration equals
the rate of elimination, which typically takes 4 to 5 half-lives.
6. A drug has a Volume of Distribution (Vd) that exceeds the total body water. What does this
suggest about the drug’s distribution?
A. The drug is highly protein-bound in the plasma
B. The drug is primarily sequestered in the vascular space
C. The drug is widely distributed into tissues or stored in fat
PHARMACOLOGY (2026/2027) ACTUAL
QUESTIONS & STUDY GUIDE
1. Which pharmacokinetic process is most significantly affected by the ‘first-pass effect’ when
a drug is administered orally?
A. Absorption
B. Excretion
C. Distribution
D. Metabolism
Answer: D
Conceptual Explanation: The first-pass effect refers to the rapid hepatic metabolism of a
drug as it passes from the gastrointestinal tract through the portal vein to the liver before
reaching systemic circulation.
2. A patient is prescribed a drug that is known to be a potent CYP450 inducer. What effect will
this have on a co-administered drug that is a substrate of the same enzyme system?
A. Increased plasma levels of the substrate drug
,B. Decreased plasma levels of the substrate drug
C. Increased risk of substrate drug toxicity
D. No change in drug levels
Answer: B
Conceptual Explanation: CYP450 inducers speed up the metabolism of substrate drugs,
leading to decreased plasma concentrations and potentially sub-therapeutic effects.
3. What term describes the concentration of a drug required to produce 50% of its maximum
effect?
A. Efficacy
B. Potency (EC50)
C. Therapeutic Index
D. Affinity
Answer: B
Conceptual Explanation: Potency is often expressed as the EC50 (effective concentration),
which is the dose required to achieve half of the drug’s maximal response.
4. Which of the following describes an ‘agonist’ in pharmacodynamics?
A. A drug that binds to a receptor and prevents activation
B. A drug that competes with the endogenous ligand for the active site
, C. A drug that binds to a receptor and activates it to produce a biological response
D. A drug that permanently denatures the receptor protein
Answer: C
Conceptual Explanation: An agonist mimics the action of endogenous ligands by binding
to and activating specific receptors.
5. How many half-lives are generally required for a drug to reach steady-state concentration
in the plasma?
A. 4 to 5 half-lives
B. 1 to 2 half-lives
C. 8 to 10 half-lives
D. Exactly 3 half-lives
Answer: A
Conceptual Explanation: Steady state occurs when the rate of drug administration equals
the rate of elimination, which typically takes 4 to 5 half-lives.
6. A drug has a Volume of Distribution (Vd) that exceeds the total body water. What does this
suggest about the drug’s distribution?
A. The drug is highly protein-bound in the plasma
B. The drug is primarily sequestered in the vascular space
C. The drug is widely distributed into tissues or stored in fat
