ADVANCED PHARMACOLOGY EXAM 1:
NURS 6521 QUESTIONS AND ANSWERS
100% VERIFIED BY EXPERTS. 2026/2027
: WALDEN UNIVERSITY
1. When considering the first-pass effect, which route of administration allows a drug to
bypass the liver initially and enter the systemic circulation directly?
A. Oral
B. Gastric tube
C. Transdermal
D. Portal vein injection
Answer: C
Conceptual Explanation: The first-pass effect occurs when a drug is metabolized by the
liver before reaching systemic circulation. Transdermal, sublingual, and parenteral routes
bypass this initial hepatic metabolism.
2. A patient is taking a drug that is a known CYP450 enzyme inducer. What effect will this
have on a co-administered drug that is metabolized by the same enzyme system?
A. Decreased therapeutic effect of the second drug
B. Increased plasma levels of the second drug
,C. Prolonged half-life of the second drug
D. Increased risk of toxicity of the second drug
Answer: A
Conceptual Explanation: Enzyme inducers increase the rate of drug metabolism, which
leads to lower plasma levels and decreased therapeutic effectiveness of the substrate drug.
3. If a drug has a half-life of 6 hours, approximately how many hours will it take to reach
steady-state plasma concentrations?
A. 12 hours
B. 6 hours
C. 24 to 30 hours
D. 48 to 60 hours
Answer: C
Conceptual Explanation: Steady state is generally reached after 4 to 5 half-lives. 6 hours x
4 = 24 hours; 6 hours x 5 = 30 hours.
4. Which factor most significantly influences drug distribution to the central nervous system
(CNS)?
A. Protein binding
B. Lipid solubility
C. Molecular weight
, D. Gastric pH
Answer: B
Conceptual Explanation: The blood-brain barrier is composed of tight junctions and a
lipid membrane, meaning only highly lipid-soluble drugs (or those with specific transport
systems) can cross effectively.
5. A patient with hypoalbuminemia is prescribed a highly protein-bound drug. The nurse
practitioner understands that this patient is at risk for:
A. Sub-therapeutic drug levels
B. Delayed drug absorption
C. Drug toxicity
D. Rapid drug excretion
Answer: C
Conceptual Explanation: Low albumin levels mean fewer binding sites for the drug,
resulting in a higher fraction of ‘free’ (active) drug in the plasma, increasing the risk of
toxicity.
6. Which of the following describes an agonist drug?
A. A drug that binds to a receptor and prevents activation
B. A drug that acts as a competitive inhibitor
C. A drug that binds covalently to a receptor to permanently deactivate it
NURS 6521 QUESTIONS AND ANSWERS
100% VERIFIED BY EXPERTS. 2026/2027
: WALDEN UNIVERSITY
1. When considering the first-pass effect, which route of administration allows a drug to
bypass the liver initially and enter the systemic circulation directly?
A. Oral
B. Gastric tube
C. Transdermal
D. Portal vein injection
Answer: C
Conceptual Explanation: The first-pass effect occurs when a drug is metabolized by the
liver before reaching systemic circulation. Transdermal, sublingual, and parenteral routes
bypass this initial hepatic metabolism.
2. A patient is taking a drug that is a known CYP450 enzyme inducer. What effect will this
have on a co-administered drug that is metabolized by the same enzyme system?
A. Decreased therapeutic effect of the second drug
B. Increased plasma levels of the second drug
,C. Prolonged half-life of the second drug
D. Increased risk of toxicity of the second drug
Answer: A
Conceptual Explanation: Enzyme inducers increase the rate of drug metabolism, which
leads to lower plasma levels and decreased therapeutic effectiveness of the substrate drug.
3. If a drug has a half-life of 6 hours, approximately how many hours will it take to reach
steady-state plasma concentrations?
A. 12 hours
B. 6 hours
C. 24 to 30 hours
D. 48 to 60 hours
Answer: C
Conceptual Explanation: Steady state is generally reached after 4 to 5 half-lives. 6 hours x
4 = 24 hours; 6 hours x 5 = 30 hours.
4. Which factor most significantly influences drug distribution to the central nervous system
(CNS)?
A. Protein binding
B. Lipid solubility
C. Molecular weight
, D. Gastric pH
Answer: B
Conceptual Explanation: The blood-brain barrier is composed of tight junctions and a
lipid membrane, meaning only highly lipid-soluble drugs (or those with specific transport
systems) can cross effectively.
5. A patient with hypoalbuminemia is prescribed a highly protein-bound drug. The nurse
practitioner understands that this patient is at risk for:
A. Sub-therapeutic drug levels
B. Delayed drug absorption
C. Drug toxicity
D. Rapid drug excretion
Answer: C
Conceptual Explanation: Low albumin levels mean fewer binding sites for the drug,
resulting in a higher fraction of ‘free’ (active) drug in the plasma, increasing the risk of
toxicity.
6. Which of the following describes an agonist drug?
A. A drug that binds to a receptor and prevents activation
B. A drug that acts as a competitive inhibitor
C. A drug that binds covalently to a receptor to permanently deactivate it
