NU150 | NU150 Pharmacology Exam 1 v2 |
Questions with Correct Answers and Expert
Explanation for Each Question | Galen
1. Which phase of pharmacokinetics is most significantly affected by a patient’s liver
failure?
A. Absorption
B. Distribution
C. Metabolism
D. Excretion
Correct Answer: C
Expert Explanation: The liver is the primary organ responsible for the metabolic
breakdown of drugs in the body. When a patient suffers from liver failure, the
enzymatic processes required to transform drugs into metabolites are impaired.
This can lead to increased drug levels and potential toxicity if dosages are not
adjusted.
2. A drug with a high protein-binding affinity will result in which of the following?
A. Decreased amount of free drug
B. Increased therapeutic effect
C. Rapid excretion by the kidneys
,D. Increased risk of immediate toxicity
Correct Answer: A
Expert Explanation: Drugs that bind to proteins like albumin are considered
inactive while they are bound. Only the ‘free’ or unbound portion of the drug is
pharmacologically active and able to exert a therapeutic effect. Therefore, a high
protein-binding affinity means less free drug is available in the systemic circulation
at any given time.
3. The nurse is administering a medication with a narrow therapeutic index. Which
action is most important?
A. Administer the drug with food to prevent GI upset
B. Monitor serum drug levels frequently
C. Teach the patient to take the drug twice a day
D. Encourage increased fluid intake
Correct Answer: B
Expert Explanation: A narrow therapeutic index indicates that the difference
between a therapeutic dose and a toxic dose is very small. Close monitoring of blood
levels is essential to ensure the drug remains within the safe therapeutic range. This
helps prevent serious adverse effects or subtherapeutic outcomes for the patient.
, 4. Which route of administration is subject to the ‘first-pass effect’?
A. Intravenous (IV)
B. Sublingual (SL)
C. Transdermal (TD)
D. Oral (PO)
Correct Answer: D
Expert Explanation: The first-pass effect refers to the metabolism of a drug by the
liver after being absorbed from the gastrointestinal tract. Oral medications are
transported via the portal vein to the liver before reaching systemic circulation.
Other routes like sublingual or intravenous bypass the liver initially, maintaining
higher bioavailability.
5. What is the primary purpose of a ‘loading dose’?
A. To reduce the risk of side effects
B. To evaluate the patient’s allergic response
C. To achieve a steady state concentration more quickly
D. To prevent the drug from being excreted too fast
Correct Answer: C
Questions with Correct Answers and Expert
Explanation for Each Question | Galen
1. Which phase of pharmacokinetics is most significantly affected by a patient’s liver
failure?
A. Absorption
B. Distribution
C. Metabolism
D. Excretion
Correct Answer: C
Expert Explanation: The liver is the primary organ responsible for the metabolic
breakdown of drugs in the body. When a patient suffers from liver failure, the
enzymatic processes required to transform drugs into metabolites are impaired.
This can lead to increased drug levels and potential toxicity if dosages are not
adjusted.
2. A drug with a high protein-binding affinity will result in which of the following?
A. Decreased amount of free drug
B. Increased therapeutic effect
C. Rapid excretion by the kidneys
,D. Increased risk of immediate toxicity
Correct Answer: A
Expert Explanation: Drugs that bind to proteins like albumin are considered
inactive while they are bound. Only the ‘free’ or unbound portion of the drug is
pharmacologically active and able to exert a therapeutic effect. Therefore, a high
protein-binding affinity means less free drug is available in the systemic circulation
at any given time.
3. The nurse is administering a medication with a narrow therapeutic index. Which
action is most important?
A. Administer the drug with food to prevent GI upset
B. Monitor serum drug levels frequently
C. Teach the patient to take the drug twice a day
D. Encourage increased fluid intake
Correct Answer: B
Expert Explanation: A narrow therapeutic index indicates that the difference
between a therapeutic dose and a toxic dose is very small. Close monitoring of blood
levels is essential to ensure the drug remains within the safe therapeutic range. This
helps prevent serious adverse effects or subtherapeutic outcomes for the patient.
, 4. Which route of administration is subject to the ‘first-pass effect’?
A. Intravenous (IV)
B. Sublingual (SL)
C. Transdermal (TD)
D. Oral (PO)
Correct Answer: D
Expert Explanation: The first-pass effect refers to the metabolism of a drug by the
liver after being absorbed from the gastrointestinal tract. Oral medications are
transported via the portal vein to the liver before reaching systemic circulation.
Other routes like sublingual or intravenous bypass the liver initially, maintaining
higher bioavailability.
5. What is the primary purpose of a ‘loading dose’?
A. To reduce the risk of side effects
B. To evaluate the patient’s allergic response
C. To achieve a steady state concentration more quickly
D. To prevent the drug from being excreted too fast
Correct Answer: C
